OpenTelemetry.Exporter.OpenTelemetryProtocol

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS).

Details

#5980 introduced a retry path that parses grpc-status-details-bin to extract gRPC retry delay information for retryable responses.

On that path:

• OtlpGrpcExportClient captures grpc-status-details-bin from retryable status responses (ResourceExhausted / Unavailable).
• OtlpRetry invokes GrpcStatusDeserializer.TryGetGrpcRetryDelay using this untrusted trailer value.
• GrpcStatusDeserializer.DecodeBytes decoded a protobuf varint length and allocated new byte[length] without validating the bounds against the remaining payload size.

A malicious or compromised collector (or a MitM in weakly-protected deployments) could return a crafted grpc-status-details-bin payload that forces oversized allocation and memory exhaustion in the instrumented process.

Impact

If an OTLP/gRPC endpoint is attacker-controlled (or traffic is intercepted), a crafted retryable response can trigger large allocations during trailer parsing, which may exhaust memory and cause process instability/crash (availability impact / DoS).

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7064 updates GrpcStatusDeserializer to validate decoded length-delimited field sizes before allocation by ensuring the requested length is sane and does not exceed the remaining payload.

This causes malformed or truncated grpc-status-details-bin payloads to fail safely instead of attempting unbounded allocation.

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS).

Details

#5980 introduced a retry path that parses grpc-status-details-bin to extract gRPC retry delay information for retryable responses.

On that path:

• OtlpGrpcExportClient captures grpc-status-details-bin from retryable status responses (ResourceExhausted / Unavailable).
• OtlpRetry invokes GrpcStatusDeserializer.TryGetGrpcRetryDelay using this untrusted trailer value.
• GrpcStatusDeserializer.DecodeBytes decoded a protobuf varint length and allocated new byte[length] without validating the bounds against the remaining payload size.

A malicious or compromised collector (or a MitM in weakly-protected deployments) could return a crafted grpc-status-details-bin payload that forces oversized allocation and memory exhaustion in the instrumented process.

Impact

If an OTLP/gRPC endpoint is attacker-controlled (or traffic is intercepted), a crafted retryable response can trigger large allocations during trailer parsing, which may exhaust memory and cause process instability/crash (availability impact / DoS).

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7064 updates GrpcStatusDeserializer to validate decoded length-delimited field sizes before allocation by ensuring the requested length is sane and does not exceed the remaining payload.

This causes malformed or truncated grpc-status-details-bin payloads to fail safely instead of attempting unbounded allocation.

Summary

When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed.

This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response.

Details

https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564 introduced a change to read the response body when a non-200 HTTP status code is received when exporting telemetry to aid debugging by operators so that the error response is included in the logs emitted by the exporter for both gRPC and HTTP/protobuf.

An unintended consequence of this change is that the response body is fully read into memory when received with no upper-bound.

This vulnerability was surfaced during the investigation of GHSA-w8rr-5gcm-pp58.

Impact

If an application using the OTLP exporter is configured to use a back-end/collector endpoint that is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response the application could have its memory exhausted and create a denial-of-service condition.

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7017 updates the OTLP exporter for both gRPC and HTTP to:

• Limit the number of bytes read from the response body in an error condition to 4MiB (see https://github.com/open-telemetry/opentelemetry-proto/pull/781);
• Only attempt to read the response body if OpenTelemetry error logging is enabled.

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS).

Details

#5980 introduced a retry path that parses grpc-status-details-bin to extract gRPC retry delay information for retryable responses.

On that path:

• OtlpGrpcExportClient captures grpc-status-details-bin from retryable status responses (ResourceExhausted / Unavailable).
• OtlpRetry invokes GrpcStatusDeserializer.TryGetGrpcRetryDelay using this untrusted trailer value.
• GrpcStatusDeserializer.DecodeBytes decoded a protobuf varint length and allocated new byte[length] without validating the bounds against the remaining payload size.

A malicious or compromised collector (or a MitM in weakly-protected deployments) could return a crafted grpc-status-details-bin payload that forces oversized allocation and memory exhaustion in the instrumented process.

Impact

If an OTLP/gRPC endpoint is attacker-controlled (or traffic is intercepted), a crafted retryable response can trigger large allocations during trailer parsing, which may exhaust memory and cause process instability/crash (availability impact / DoS).

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7064 updates GrpcStatusDeserializer to validate decoded length-delimited field sizes before allocation by ensuring the requested length is sane and does not exceed the remaining payload.

This causes malformed or truncated grpc-status-details-bin payloads to fail safely instead of attempting unbounded allocation.

Summary

When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed.

This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response.

Details

https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564 introduced a change to read the response body when a non-200 HTTP status code is received when exporting telemetry to aid debugging by operators so that the error response is included in the logs emitted by the exporter for both gRPC and HTTP/protobuf.

An unintended consequence of this change is that the response body is fully read into memory when received with no upper-bound.

This vulnerability was surfaced during the investigation of GHSA-w8rr-5gcm-pp58.

Impact

If an application using the OTLP exporter is configured to use a back-end/collector endpoint that is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response the application could have its memory exhausted and create a denial-of-service condition.

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7017 updates the OTLP exporter for both gRPC and HTTP to:

• Limit the number of bytes read from the response body in an error condition to 4MiB (see https://github.com/open-telemetry/opentelemetry-proto/pull/781);
• Only attempt to read the response body if OpenTelemetry error logging is enabled.

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS).

Details

#5980 introduced a retry path that parses grpc-status-details-bin to extract gRPC retry delay information for retryable responses.

On that path:

• OtlpGrpcExportClient captures grpc-status-details-bin from retryable status responses (ResourceExhausted / Unavailable).
• OtlpRetry invokes GrpcStatusDeserializer.TryGetGrpcRetryDelay using this untrusted trailer value.
• GrpcStatusDeserializer.DecodeBytes decoded a protobuf varint length and allocated new byte[length] without validating the bounds against the remaining payload size.

A malicious or compromised collector (or a MitM in weakly-protected deployments) could return a crafted grpc-status-details-bin payload that forces oversized allocation and memory exhaustion in the instrumented process.

Impact

If an OTLP/gRPC endpoint is attacker-controlled (or traffic is intercepted), a crafted retryable response can trigger large allocations during trailer parsing, which may exhaust memory and cause process instability/crash (availability impact / DoS).

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7064 updates GrpcStatusDeserializer to validate decoded length-delimited field sizes before allocation by ensuring the requested length is sane and does not exceed the remaining payload.

This causes malformed or truncated grpc-status-details-bin payloads to fail safely instead of attempting unbounded allocation.

Summary

When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed.

This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response.

Details

https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564 introduced a change to read the response body when a non-200 HTTP status code is received when exporting telemetry to aid debugging by operators so that the error response is included in the logs emitted by the exporter for both gRPC and HTTP/protobuf.

An unintended consequence of this change is that the response body is fully read into memory when received with no upper-bound.

This vulnerability was surfaced during the investigation of GHSA-w8rr-5gcm-pp58.

Impact

If an application using the OTLP exporter is configured to use a back-end/collector endpoint that is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response the application could have its memory exhausted and create a denial-of-service condition.

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7017 updates the OTLP exporter for both gRPC and HTTP to:

• Limit the number of bytes read from the response body in an error condition to 4MiB (see https://github.com/open-telemetry/opentelemetry-proto/pull/781);
• Only attempt to read the response body if OpenTelemetry error logging is enabled.

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS).

Details

#5980 introduced a retry path that parses grpc-status-details-bin to extract gRPC retry delay information for retryable responses.

On that path:

• OtlpGrpcExportClient captures grpc-status-details-bin from retryable status responses (ResourceExhausted / Unavailable).
• OtlpRetry invokes GrpcStatusDeserializer.TryGetGrpcRetryDelay using this untrusted trailer value.
• GrpcStatusDeserializer.DecodeBytes decoded a protobuf varint length and allocated new byte[length] without validating the bounds against the remaining payload size.

A malicious or compromised collector (or a MitM in weakly-protected deployments) could return a crafted grpc-status-details-bin payload that forces oversized allocation and memory exhaustion in the instrumented process.

Impact

If an OTLP/gRPC endpoint is attacker-controlled (or traffic is intercepted), a crafted retryable response can trigger large allocations during trailer parsing, which may exhaust memory and cause process instability/crash (availability impact / DoS).

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7064 updates GrpcStatusDeserializer to validate decoded length-delimited field sizes before allocation by ensuring the requested length is sane and does not exceed the remaining payload.

This causes malformed or truncated grpc-status-details-bin payloads to fail safely instead of attempting unbounded allocation.

Summary

When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed.

This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response.

Details

https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564 introduced a change to read the response body when a non-200 HTTP status code is received when exporting telemetry to aid debugging by operators so that the error response is included in the logs emitted by the exporter for both gRPC and HTTP/protobuf.

An unintended consequence of this change is that the response body is fully read into memory when received with no upper-bound.

This vulnerability was surfaced during the investigation of GHSA-w8rr-5gcm-pp58.

Impact

If an application using the OTLP exporter is configured to use a back-end/collector endpoint that is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response the application could have its memory exhausted and create a denial-of-service condition.

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7017 updates the OTLP exporter for both gRPC and HTTP to:

• Limit the number of bytes read from the response body in an error condition to 4MiB (see https://github.com/open-telemetry/opentelemetry-proto/pull/781);
• Only attempt to read the response body if OpenTelemetry error logging is enabled.

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS).

Details

#5980 introduced a retry path that parses grpc-status-details-bin to extract gRPC retry delay information for retryable responses.

On that path:

• OtlpGrpcExportClient captures grpc-status-details-bin from retryable status responses (ResourceExhausted / Unavailable).
• OtlpRetry invokes GrpcStatusDeserializer.TryGetGrpcRetryDelay using this untrusted trailer value.
• GrpcStatusDeserializer.DecodeBytes decoded a protobuf varint length and allocated new byte[length] without validating the bounds against the remaining payload size.

A malicious or compromised collector (or a MitM in weakly-protected deployments) could return a crafted grpc-status-details-bin payload that forces oversized allocation and memory exhaustion in the instrumented process.

Impact

If an OTLP/gRPC endpoint is attacker-controlled (or traffic is intercepted), a crafted retryable response can trigger large allocations during trailer parsing, which may exhaust memory and cause process instability/crash (availability impact / DoS).

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7064 updates GrpcStatusDeserializer to validate decoded length-delimited field sizes before allocation by ensuring the requested length is sane and does not exceed the remaining payload.

This causes malformed or truncated grpc-status-details-bin payloads to fail safely instead of attempting unbounded allocation.

Summary

When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed.

This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response.

Details

https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564 introduced a change to read the response body when a non-200 HTTP status code is received when exporting telemetry to aid debugging by operators so that the error response is included in the logs emitted by the exporter for both gRPC and HTTP/protobuf.

An unintended consequence of this change is that the response body is fully read into memory when received with no upper-bound.

This vulnerability was surfaced during the investigation of GHSA-w8rr-5gcm-pp58.

Impact

If an application using the OTLP exporter is configured to use a back-end/collector endpoint that is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response the application could have its memory exhausted and create a denial-of-service condition.

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7017 updates the OTLP exporter for both gRPC and HTTP to:

• Limit the number of bytes read from the response body in an error condition to 4MiB (see https://github.com/open-telemetry/opentelemetry-proto/pull/781);
• Only attempt to read the response body if OpenTelemetry error logging is enabled.

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106

Summary

The OTLP disk retry feature in OpenTelemetry.Exporter.OpenTelemetryProtocol silently fell back to Path.GetTempPath() when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk was set but OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH was not configured.

The exporter stored and loaded *.blob files under fixed, signal-named subdirectories (traces, metrics, logs) beneath that shared temporary root path.

On multi-user systems where the temporary directory is accessible to other local accounts, this exposed three attack surfaces:

• Blob injection (integrity): an attacker could write crafted *.blob files into the predictable path; the exporter picks them up on the next retry cycle and forwards them to the configured OTLP endpoint under the application's identity.
• Telemetry disclosure (confidentiality): an attacker reads *.blob files written by the application between export failures, recovering encoded telemetry payloads (spans, metric data points, log records).
• Resource exhaustion (availability): an attacker deposits numerous or oversized blob files, degrading retry-loop performance or consuming disk space.

Details

Preconditions

1. OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY is set to disk.
2. OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH is not set, causing the exporter to resolve the blob storage root using the System.IO.Path.GetTempPath() API.
3. A local attacker has read or write access to the process' temporary directory (e.g., /tmp on Linux, or %TEMP% on a multi-user Windows installation).

Exploit path

1. A target application starts with OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk and no explicit blob directory. The exporter resolves the storage root to Path.GetTempPath(), producing paths such as %TEMP%\traces, %TEMP%\metrics, and %TEMP%\logs (or /tmp/traces etc. on Linux).
2. Injection scenario: before or during the application's retry window, an attacker writes crafted *.blob files into one of those signal subdirectories. On the next retry interval (by default every 60 seconds), OtlpExporterPersistentStorageTransmissionHandler scans the directory, loads the attacker-supplied blobs, and forwards them to the configured OTLP endpoint using the application's identity and transport credentials.
3. Disclosure scenario: the attacker reads *.blob files that the application wrote after a transient export failure, recovering the full serialized telemetry payloads (spans, metric data points, or log records in Protobuf encoding).
4. DoS scenario: the attacker deposits a large number of oversized blob files in the temporary subdirectories, causing the retry loop to consume excess CPU/IO processing them, potentially exhausting available disk space.

Mitigations

If an immediate upgrade to a patched version is not possible:

1. Avoid enabling disk retry in shared environments.
2. Configure a dedicated directory with strict ACL/ownership and least privilege.
3. Ensure the directory is not shared across tenants/users.
4. Monitor for unexpected *.blob files or abnormal retry backlog growth.

Resources

• #7106