System.Text.Json

Provides high-performance and low-allocating types that serialize objects to JavaScript Object Notation (JSON) text and deserialize JSON text to objects, with UTF-8 support built-in. Also provides types to read and write JSON text encoded as UTF-8, and to create an in-memory document object model (DOM), that is read-only, for random access of the JSON elements within a structured view of the data. The System.Text.Json library is built-in as part of the shared framework in .NET Runtime. The package can be installed when you need to use it in other target frameworks.

View on Nuget

Activity

Latest release: 5d ago
Total releases: 139
Cadence: ~4 days
Last 12 months: 33

Details

License: MIT
First release: May 10, 2019

Releases

Version	Released
`9.0.20` patch	Sep 08, 2026
`10.0.12` patch	Sep 08, 2026
`11.0.0-rc.1.26425.128` pre	Sep 08, 2026
`10.0.11` patch	Aug 11, 2026
`9.0.19` patch	Aug 11, 2026
`11.0.0-preview.7.26381.103` pre	Aug 11, 2026
`10.0.10` patch	Jul 14, 2026
`9.0.18` patch	Jul 14, 2026
`11.0.0-preview.6.26359.118` pre	Jul 14, 2026
`10.0.9` patch	Jun 09, 2026
`9.0.17` patch	Jun 09, 2026
`11.0.0-preview.5.26302.115` pre	Jun 09, 2026
`10.0.8` patch	May 12, 2026
`9.0.16` patch	May 12, 2026
`11.0.0-preview.4.26230.115` pre	May 12, 2026
`10.0.7` patch	Apr 21, 2026
`9.0.15` patch	Apr 14, 2026
`10.0.6` patch	Apr 14, 2026
`11.0.0-preview.3.26207.106` pre	Apr 14, 2026
`10.0.5` patch	Mar 12, 2026
`11.0.0-preview.2.26159.112` pre	Mar 10, 2026
`9.0.14` patch	Mar 10, 2026
`10.0.4` patch	Mar 10, 2026
`11.0.0-preview.1.26104.118` pre	Feb 10, 2026
`9.0.13` patch	Feb 10, 2026
`10.0.3` patch	Feb 10, 2026
`10.0.2` patch	Jan 13, 2026
`9.0.12` patch	Jan 13, 2026
`10.0.1` patch	Dec 09, 2025
`10.0.0` major	Nov 11, 2025
`9.0.11` patch	Nov 11, 2025
`10.0.0-rc.2.25502.107` pre	Oct 14, 2025
`9.0.10` patch	Oct 14, 2025
`9.0.9` patch	Sep 09, 2025
`10.0.0-rc.1.25451.107` pre	Sep 09, 2025
`10.0.0-preview.7.25380.108` pre	Aug 12, 2025
`9.0.8` patch	Aug 05, 2025
`10.0.0-preview.6.25358.103` pre	Jul 15, 2025
`9.0.7` patch	Jul 08, 2025
`8.0.6` patch	Jul 08, 2025
`9.0.6` patch	Jun 10, 2025
`10.0.0-preview.5.25277.114` pre	Jun 06, 2025
`9.0.5` patch	May 13, 2025
`10.0.0-preview.4.25258.110` pre	May 12, 2025
`10.0.0-preview.3.25171.5` pre	Apr 10, 2025
`9.0.4` patch	Apr 08, 2025
`10.0.0-preview.2.25163.2` pre	Mar 18, 2025
`9.0.3` patch	Mar 11, 2025
`10.0.0-preview.1.25080.5` pre	Feb 25, 2025
`9.0.2` patch	Feb 11, 2025

1–50 of 139

Dependencies (8)

Depends on

9.0.20

Used by

14648

Supply-chain exposure

14,648 tracked projects depend on this, <1% of every package we track.

A known CVE here directly exposes every one of them.

Known CVEs (2)

CVE-2024-43485 GHSA-8g4q-xg66-9fp4 BIT-dotnet-2024-43485 BIT-dotnet-sdk-2024-43485 Oct 08, 2024

Microsoft Security Advisory CVE-2024-43485 | .NET Denial of Service Vulnerability

High
Network Low None None

Microsoft Security Advisory CVE-2024-43485 | .NET Denial of Service Vulnerability

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in System.Text.Json 6.0.x and 8.0.x. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

In System.Text.Json 6.0.x and 8.0.x, applications which deserialize input to a model with an [JsonExtensionData] property can be vulnerable to an algorithmic complexity attack resulting in Denial of Service.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/329

Mitigation factors

JSON models which do not utilize the [JsonExtensionData] feature are not impacted by this vulnerability.

Affected software

Any .NET 8.0 application running on .NET 8.0.8 or earlier.

Any .NET 6.0 aplication running on .NET 6.0.33 or earlier.

Any application consuming one of the vulnerable packages.

Affected Packages

The vulnerability affects any Microsoft .NET Core project if it uses any of affected packages versions listed below

.NET 8

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- System.Text.Json | >= 8.0.0, <= 8.0.4 | 8.0.5

.NET 6

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- System.Text.Json | >= 6.0.0, <= 6.0.9 | 6.0.10

Advisory FAQ

How do I know if I am affected?

If you have a runtime or SDK with a version listed, or an affected package listed in affected software or affected packages, you're exposed to the vulnerability.

How do I fix the issue?

To fix the issue please install the latest version of .NET 8.0 or .NET 6.0. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.

.NET Framework-based applications and other application types need to perform a package update.

If you have .NET 6.0 or greater installed, you can list the versions you have installed by running the dotnet --info command. You will see output like the following;

.NET Core SDK (reflecting any global.json): Version: 8.0.200 Commit: 8473146e7d Runtime Environment: OS Name: Windows OS Version: 10.0.18363 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\6.0.300\ Host (useful for support): Version: 8.0.3 Commit: 8473146e7d .NET Core SDKs installed: 8.0.200 [C:\Program Files\dotnet\sdk] .NET Core runtimes installed: Microsoft.AspAspNetCore.App 8.0.3 [C:\Program Files\dotnet\shared\Microsoft.AspAspNetCore.App] Microsoft.AspNetCore.App 8.0.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.WindowsDesktop.App 8.0.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] To install additional .NET Core runtimes or SDKs: https://aka.ms/dotnet-download

If you're using .NET 6.0, you should download and install .NET 6.0.35 Runtime or .NET 6.0.135 SDK (for Visual Studio 2022 v17.6) from https://dotnet.microsoft.com/download/dotnet-core/6.0.

If you're using .NET 8.0, you should download and install .NET 8.0.10 Runtime or .NET 8.0.110 SDK (for Visual Studio 2022 v17.8) from https://dotnet.microsoft.com/download/dotnet-core/8.0.

.NET 8.0 and .NET 6.0 updates are also available from Microsoft Update. To access this either type "Check for updates" in your Windows search, or open Settings, choose Update & Security and then click Check for Updates.

Once you have installed the updated runtime or SDK, restart your apps for the update to take effect.

Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.

Other Information

Reporting Security Issues

If you have found a potential security issue in .NET 8.0 or .NET 6.0, please email details to secure@microsoft.com. Reports may qualify for the Microsoft .NET Core & .NET 5 Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.

Support

You can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime and https://github.com/dotnet/aspnet/. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.

Disclaimer

The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

External Links

CVE-2024-43485

Revisions

V1.0 (October 08, 2024): Advisory published.

Version 1.0

Last Updated 2024-10-08

Affected versions

8.0.08.0.18.0.28.0.38.0.46.0.06.0.16.0.26.0.36.0.46.0.56.0.6

+ 3 more Show less

6.0.76.0.86.0.9

Fixed in

6.0.108.0.5

References

https://github.com/dotnet/runtime/security/advisories/GHSA-8g4q-xg66-9fp4
https://nvd.nist.gov/vuln/detail/CVE-2024-43485
https://github.com/dotnet/announcements/issues/329
https://github.com/dotnet/runtime/issues/108678
https://github.com/dotnet/runtime
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43485

Updated Oct 24, 2024 · Source: OSV.dev
CVE-2024-30105 GHSA-hh2w-p6rv-4g7w BIT-dotnet-2024-30105 BIT-dotnet-sdk-2024-30105 Jul 09, 2024

Microsoft Security Advisory CVE-2024-30105 | .NET Denial of Service Vulnerability

High
Network Low None None

Microsoft Security Advisory CVE-2024-30105 | .NET Denial of Service Vulnerability

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A vulnerability exists in .NET when calling the JsonSerializer.DeserializeAsyncEnumerable method against an untrusted input using System.Text.Json may result in Denial of Service.

Discussion

Discussion for this issue can be found at https://github.com/dotnet/runtime/issues/104619

Mitigation factors

Microsoft has not identified any mitigating factors for this vulnerability.

Affected software

Any .NET 8.0 application running on .NET 8.0.6 or earlier.

Affected Packages

The vulnerability affects any Microsoft .NET Core project if it uses any of affected packages versions listed below

.NET 8

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- System.Text.Json | >= 7.0.0, < =8.0.3 | 8.0.4

Advisory FAQ

How do I know if I am affected?

If you have a runtime or SDK with a version listed, or an affected package listed in affected software or affected packages, you're exposed to the vulnerability.

How do I fix the issue?

To fix the issue please install the latest version of .NET 8.0 . If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.

If you have .NET 6.0 or greater installed, you can list the versions you have installed by running the dotnet --info command. You will see output like the following;

.NET Core SDK (reflecting any global.json): Version: 8.0.200 Commit: 8473146e7d Runtime Environment: OS Name: Windows OS Version: 10.0.18363 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\6.0.300\ Host (useful for support): Version: 8.0.3 Commit: 8473146e7d .NET Core SDKs installed: 8.0.200 [C:\Program Files\dotnet\sdk] .NET Core runtimes installed: Microsoft.AspAspNetCore.App 8.0.3 [C:\Program Files\dotnet\shared\Microsoft.AspAspNetCore.App] Microsoft.AspNetCore.App 8.0.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.WindowsDesktop.App 8.0.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] To install additional .NET Core runtimes or SDKs: https://aka.ms/dotnet-download

If you're using .NET 8.0, you should download and install .NET 8.0.7 Runtime or .NET 8.0.107 SDK (for Visual Studio 2022 v17.8) from https://dotnet.microsoft.com/download/dotnet-core/8.0.

.NET 8.0 updates are also available from Microsoft Update. To access this either type "Check for updates" in your Windows search, or open Settings, choose Update & Security and then click Check for Updates.

Once you have installed the updated runtime or SDK, restart your apps for the update to take effect.

Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.

Other Information

Reporting Security Issues

If you have found a potential security issue in .NET 8.0 or .NET 7.0 or .NET 6.0, please email details to secure@microsoft.com. Reports may qualify for the Microsoft .NET Core & .NET 5 Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.

Support

You can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime and https://github.com/dotnet/aspnet/. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.

Disclaimer

The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

External Links

CVE-2024-30105

Revisions

V1.0 (July 09, 2024): Advisory published.

Version 1.0

Last Updated 2024-07-09

Affected versions

7.0.07.0.17.0.27.0.37.0.48.0.08.0.18.0.28.0.3

Fixed in

8.0.4

References

https://github.com/dotnet/runtime/security/advisories/GHSA-hh2w-p6rv-4g7w
https://nvd.nist.gov/vuln/detail/CVE-2024-30105
https://github.com/dotnet/runtime
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-30105

Updated Sep 10, 2026 · Source: OSV.dev

Insights

Releases per month

last 12 months

Release mix

major 6
minor 1
patch 57
pre 74

139 releases

Dependencies over time

per release

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2026

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