GHSA-r6mh-95jw-g7qg: Medium severity nuget/Microsoft.NETCore.App.Runtime.osx-x64 vulnerability

Published Aug 11, 2026
·
Updated

Executive summary

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

Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/427

CVSS Details

- Version: 3.1 - Severity: Medium - Score: 5.9 - Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Weakness: CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Affected Platforms

- Platforms: Linux, macOS - Architectures: All

<a name="affected-packages"></a>Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below

<a name=".NET 10"></a>.NET 10 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.NETCore.App.Runtime.linux-arm | >= 10.0.0, <= 10.0.10 | 10.0.11 Microsoft.NETCore.App.Runtime.linux-arm64 | >= 10.0.0, <= 10.0.10 | 10.0.11 Microsoft.NETCore.App.Runtime.linux-musl-arm | >= 10.0.0, <= 10.0.10 | 10.0.11 Microsoft.NETCore.App.Runtime.linux-musl-arm64 | >= 10.0.0, <= 10.0.10 | 10.0.11 Microsoft.NETCore.App.Runtime.linux-musl-x64 | >= 10.0.0, <= 10.0.10 | 10.0.11 Microsoft.NETCore.App.Runtime.linux-x64 | >= 10.0.0, <= 10.0.10 | 10.0.11 Microsoft.NETCore.App.Runtime.osx-arm64 | >= 10.0.0, <= 10.0.10 | 10.0.11 Microsoft.NETCore.App.Runtime.osx-x64 | >= 10.0.0, <= 10.0.10 | 10.0.11

<a name=".NET 9"></a>.NET 9 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.NETCore.App.Runtime.linux-arm | >= 9.0.0, <= 9.0.18 | 9.0.19 Microsoft.NETCore.App.Runtime.linux-arm64 | >= 9.0.0, <= 9.0.18 | 9.0.19 Microsoft.NETCore.App.Runtime.linux-musl-arm | >= 9.0.0, <= 9.0.18 | 9.0.19 Microsoft.NETCore.App.Runtime.linux-musl-arm64 | >= 9.0.0, <= 9.0.18 | 9.0.19 Microsoft.NETCore.App.Runtime.linux-musl-x64 | >= 9.0.0, <= 9.0.18 | 9.0.19 Microsoft.NETCore.App.Runtime.linux-x64 | >= 9.0.0, <= 9.0.18 | 9.0.19 Microsoft.NETCore.App.Runtime.osx-arm64 | >= 9.0.0, <= 9.0.18 | 9.0.19 Microsoft.NETCore.App.Runtime.osx-x64 | >= 9.0.0, <= 9.0.18 | 9.0.19

<a name=".NET 8"></a>.NET 8 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.NETCore.App.Runtime.linux-arm | >= 8.0.0, <= 8.0.29 | 8.0.30 Microsoft.NETCore.App.Runtime.linux-arm64 | >= 8.0.0, <= 8.0.29 | 8.0.30 Microsoft.NETCore.App.Runtime.linux-musl-arm | >= 8.0.0, <= 8.0.29 | 8.0.30 Microsoft.NETCore.App.Runtime.linux-musl-arm64 | >= 8.0.0, <= 8.0.29 | 8.0.30 Microsoft.NETCore.App.Runtime.linux-musl-x64 | >= 8.0.0, <= 8.0.29 | 8.0.30 Microsoft.NETCore.App.Runtime.linux-x64 | >= 8.0.0, <= 8.0.29 | 8.0.30 Microsoft.NETCore.App.Runtime.osx-arm64 | >= 8.0.0, <= 8.0.29 | 8.0.30 Microsoft.NETCore.App.Runtime.osx-x64 | >= 8.0.0, <= 8.0.29 | 8.0.30

Advisory FAQ

<a name="how-affected"></a>How do I know if I am affected?

If using a package listed in affected packages, users are exposed to the vulnerability.

<a name="how-fix"></a>How do I fix the issue?

1. To fix the issue please install the latest version of .NET. If users have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt then to update Visual Studio, which will also update their .NET SDKs. 2. If a user application references the vulnerable package, update the package reference to the patched version. They can list the versions they have installed by running the dotnet --info command.

Once users have installed the updated runtime or SDK, they should restart their apps for the update to take effect.

Additionally, if they'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 users have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ.

Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.

Support

Users can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. Users 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-2026-62899

Acknowledgements

Miha Zupan with Microsoft

Revisions

V1.0 (08/11/2026): Advisory published.

Affected Software

24 affected componentsFixes available
nuget/Microsoft.NETCore.App.Runtime.osx-x64>=8.0.0<=8.0.29
8.0.30
nuget/Microsoft.NETCore.App.Runtime.osx-arm64>=8.0.0<=8.0.29
8.0.30
nuget/Microsoft.NETCore.App.Runtime.linux-x64>=8.0.0<=8.0.29
8.0.30
nuget/Microsoft.NETCore.App.Runtime.linux-musl-x64>=8.0.0<=8.0.29
8.0.30
nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm64>=8.0.0<=8.0.29
8.0.30
nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm>=8.0.0<=8.0.29
8.0.30
nuget/Microsoft.NETCore.App.Runtime.linux-arm64>=8.0.0<=8.0.29
8.0.30
nuget/Microsoft.NETCore.App.Runtime.linux-arm>=8.0.0<=8.0.29
8.0.30
nuget/Microsoft.NETCore.App.Runtime.osx-x64>=9.0.0<=9.0.18
9.0.19
nuget/Microsoft.NETCore.App.Runtime.osx-arm64>=9.0.0<=9.0.18
9.0.19
nuget/Microsoft.NETCore.App.Runtime.linux-x64>=9.0.0<=9.0.18
9.0.19
nuget/Microsoft.NETCore.App.Runtime.linux-musl-x64>=9.0.0<=9.0.18
9.0.19
nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm64>=9.0.0<=9.0.18
9.0.19
nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm>=9.0.0<=9.0.18
9.0.19
nuget/Microsoft.NETCore.App.Runtime.linux-arm64>=9.0.0<=9.0.18
9.0.19
nuget/Microsoft.NETCore.App.Runtime.linux-arm>=9.0.0<=9.0.18
9.0.19
nuget/Microsoft.NETCore.App.Runtime.osx-x64>=10.0.0<=10.0.10
10.0.11
nuget/Microsoft.NETCore.App.Runtime.osx-arm64>=10.0.0<=10.0.10
10.0.11
nuget/Microsoft.NETCore.App.Runtime.linux-x64>=10.0.0<=10.0.10
10.0.11
nuget/Microsoft.NETCore.App.Runtime.linux-musl-x64>=10.0.0<=10.0.10
10.0.11
nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm64>=10.0.0<=10.0.10
10.0.11
nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm>=10.0.0<=10.0.10
10.0.11
nuget/Microsoft.NETCore.App.Runtime.linux-arm64>=10.0.0<=10.0.10
10.0.11
nuget/Microsoft.NETCore.App.Runtime.linux-arm>=10.0.0<=10.0.10
10.0.11

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.osx-x64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  2. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.osx-arm64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  3. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-x64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  4. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-musl-x64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  5. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  6. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm to a version that resolves this vulnerability.

    Fixed in 8.0.30
  7. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-arm64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  8. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-arm to a version that resolves this vulnerability.

    Fixed in 8.0.30
  9. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.osx-x64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  10. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.osx-arm64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  11. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-x64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  12. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-musl-x64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  13. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  14. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm to a version that resolves this vulnerability.

    Fixed in 9.0.19
  15. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-arm64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  16. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-arm to a version that resolves this vulnerability.

    Fixed in 9.0.19
  17. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.osx-x64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  18. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.osx-arm64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  19. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-x64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  20. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-musl-x64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  21. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  22. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm to a version that resolves this vulnerability.

    Fixed in 10.0.11
  23. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-arm64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  24. Upgrade

    Upgrade nuget/Microsoft.NETCore.App.Runtime.linux-arm to a version that resolves this vulnerability.

    Fixed in 10.0.11
  25. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-arm64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  26. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-arm64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  27. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-arm64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  28. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-arm to a version that resolves this vulnerability.

    Fixed in 10.0.11
  29. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-arm to a version that resolves this vulnerability.

    Fixed in 8.0.30
  30. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-arm to a version that resolves this vulnerability.

    Fixed in 9.0.19
  31. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-musl-arm64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  32. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-musl-arm64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  33. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-musl-arm64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  34. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-musl-arm to a version that resolves this vulnerability.

    Fixed in 10.0.11
  35. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-musl-arm to a version that resolves this vulnerability.

    Fixed in 8.0.30
  36. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-musl-arm to a version that resolves this vulnerability.

    Fixed in 9.0.19
  37. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-musl-x64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  38. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-musl-x64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  39. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-musl-x64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  40. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-x64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  41. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-x64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  42. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.linux-x64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  43. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.osx-arm64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  44. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.osx-arm64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  45. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.osx-arm64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  46. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.osx-x64 to a version that resolves this vulnerability.

    Fixed in 10.0.11
  47. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.osx-x64 to a version that resolves this vulnerability.

    Fixed in 8.0.30
  48. Upgrade

    Upgrade Microsoft.NETCore.App.Runtime.osx-x64 to a version that resolves this vulnerability.

    Fixed in 9.0.19
  49. Operational

    If you deployed self-contained applications targeting any impacted versions, recompile and redeploy the applications using the patched .NET runtime.

  50. Operational

    After installing the updated runtime or SDK, restart your apps for the update to take effect.

Event History

Aug 11, 2026
Advisory Published
via GitHub·06:40 PM
Data Sourced
via GitHub·06:40 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of GHSA-r6mh-95jw-g7qg?

The severity of GHSA-r6mh-95jw-g7qg is rated as medium with a score of 5.9.

2

How do I fix GHSA-r6mh-95jw-g7qg?

To fix GHSA-r6mh-95jw-g7qg, developers should update their applications using the latest versions of the affected Microsoft.NETCore.App.Runtime packages.

3

What types of applications does GHSA-r6mh-95jw-g7qg affect?

GHSA-r6mh-95jw-g7qg affects applications that utilize the System.Net.HttpListener in various Microsoft .NET Core runtime environments.

4

Is user interaction required to exploit GHSA-r6mh-95jw-g7qg?

No, user interaction is not required to exploit GHSA-r6mh-95jw-g7qg as it has a user interaction rating of None.

5

What is the potential impact of GHSA-r6mh-95jw-g7qg?

The potential impact of GHSA-r6mh-95jw-g7qg includes high confidentiality exposure, as it allows for inconsistent interpretation of HTTP requests.

Company

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