GHSA-cpw3-h88j-9f6x

Source

https://github.com/advisories/GHSA-cpw3-h88j-9f6x

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-cpw3-h88j-9f6x

Aliases

CVE-2026-120796

Published

2026-11-10T23:21:36Z

Modified

2026-11-10T23:30:09Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C CVSS Calculator

Summary

Microsoft Security Advisory CVE-2026-120796 - .NET Denial of Service Vulnerability

Details

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET. This advisory provides guidance on updating affected applications and components.

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/499

CVSS Details

Version: 3.1
Severity: Medium
Score: 5.3 (base score)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C
Weakness: CWE-407

Affected Platforms

Platforms: Windows, Linux, macOS
Architectures: All

Affected Packages

The tables list affected version ranges and fixed package versions. Runtime and standalone deliveries are listed separately.

.NET 11.0 - affected runtime packages

Package	Affected version	Patched version
Microsoft.NETCore.App.Runtime.linux-arm	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.linux-arm64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.linux-musl-arm	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.linux-musl-arm64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.linux-musl-x64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.linux-x64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.osx-arm64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.osx-x64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.win-arm64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.win-x64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.win-x86	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0

Standalone System.Text.Json delivery

Package	Affected version	Patched version
System.Text.Json	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0

Advisory FAQ

How do I know if I am affected?

Check the deployed runtime and application package versions against the affected ranges above. Self-contained applications include their own runtime; updating a machine-wide runtime does not replace it.

How do I fix the issue?

Install the applicable runtime or update each independently referenced package to the fixed version above. Restart applications. Rebuild and redeploy self-contained applications; updating a machine-wide runtime does not replace their embedded runtime. An SDK update alone does not update an application's standalone package references.

Other Information

Reporting Security Issues

If you 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

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. 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-2026-120796

Acknowledgements

Artur Stetsko

Revisions

V1.0 (November 10, 2026): Advisory published.

Database specific

{
    "cwe_ids": [
        "CWE-407"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-11-10T23:21:36Z",
    "nvd_published_at": "2026-11-10T19:20:28Z",
    "severity": "MODERATE"
}

References

Affected packages

NuGet

Microsoft.NETCore.App.Runtime.linux-arm

Package

Name: Microsoft.NETCore.App.Runtime.linux-arm; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.linux-arm

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

Microsoft.NETCore.App.Runtime.linux-arm64

Package

Name: Microsoft.NETCore.App.Runtime.linux-arm64; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.linux-arm64

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

Microsoft.NETCore.App.Runtime.linux-musl-arm

Package

Name: Microsoft.NETCore.App.Runtime.linux-musl-arm; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

Microsoft.NETCore.App.Runtime.linux-musl-arm64

Package

Name: Microsoft.NETCore.App.Runtime.linux-musl-arm64; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.linux-musl-arm64

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

Microsoft.NETCore.App.Runtime.linux-musl-x64

Package

Name: Microsoft.NETCore.App.Runtime.linux-musl-x64; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.linux-musl-x64

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

Microsoft.NETCore.App.Runtime.linux-x64

Package

Name: Microsoft.NETCore.App.Runtime.linux-x64; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.linux-x64

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

Microsoft.NETCore.App.Runtime.osx-arm64

Package

Name: Microsoft.NETCore.App.Runtime.osx-arm64; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.osx-arm64

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

Microsoft.NETCore.App.Runtime.osx-x64

Package

Name: Microsoft.NETCore.App.Runtime.osx-x64; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.osx-x64

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

Microsoft.NETCore.App.Runtime.win-arm64

Package

Name: Microsoft.NETCore.App.Runtime.win-arm64; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.win-arm64

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

Microsoft.NETCore.App.Runtime.win-x64

Package

Name: Microsoft.NETCore.App.Runtime.win-x64; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.win-x64

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

Microsoft.NETCore.App.Runtime.win-x86

Package

Name: Microsoft.NETCore.App.Runtime.win-x86; View open source insights on deps.dev
Purl: pkg:nuget/Microsoft.NETCore.App.Runtime.win-x86

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"

System.Text.Json

Package

Name: System.Text.Json; View open source insights on deps.dev
Purl: pkg:nuget/System.Text.Json

Affected ranges

Type: ECOSYSTEM
Events: Introduced

11.0.0-preview.1.26104.118

Fixed

11.0.0

Database specific

last_known_affected_version_range

"<= 11.0.0-rc.3.26522.148"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-cpw3-h88j-9f6x/GHSA-cpw3-h88j-9f6x.json"