CVE-2026-26131: .NET Elevation of Privilege Vulnerability

CVE-2026-26131 · Severity: low · CVSS 3.1 · Published 2026-03-11

.NET Elevation of Privilege Vulnerability

Technologies: Microsoft.NetCore.App.Runtime.linux-arm (NuGet), Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet), Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet), Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet), Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet), Microsoft.NetCore.App.Runtime.linux-x64 (NuGet). Vendors: NuGet.

Quick answers

Is CVE-2026-26131 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-26131 being exploited in the wild.
How severe is CVE-2026-26131?
Low severity, with a CVSS score of 3.1, published 11 March 2026.
Which products and versions are affected?
Microsoft.NetCore.App.Runtime.linux-arm (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.4; Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.4; Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.4; Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.4; and 2 more.
Is there a fix for CVE-2026-26131?
Yes. Microsoft.NetCore.App.Runtime.linux-arm (NuGet): upgrade to 10.0.4 or later; Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 10.0.4 or later; Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 10.0.4 or later; Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 10.0.4 or later; Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 10.0.4 or later; Microsoft.NetCore.App.Runtime.linux-x64 (NuGet): upgrade to 10.0.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-26131?
Check whether you run Microsoft.NetCore.App.Runtime.linux-arm (NuGet), Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet), Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Microsoft.NetCore.App.Runtime.linux-arm (NuGet): upgrade to 10.0.4 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-arm --version 10.0.4
  • Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 10.0.4 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-arm64 --version 10.0.4
  • Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 10.0.4 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm --version 10.0.4
  • Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 10.0.4 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm64 --version 10.0.4
  • Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 10.0.4 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-x64 --version 10.0.4
  • Microsoft.NetCore.App.Runtime.linux-x64 (NuGet): upgrade to 10.0.4 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-x64 --version 10.0.4

Affected products

  • Microsoft.NetCore.App.Runtime.linux-arm (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.4
  • Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.4
  • Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.4
  • Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.4
  • Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.4
  • Microsoft.NetCore.App.Runtime.linux-x64 (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.4

Identifiers

  • CVE-2026-26131
  • GHSA-crjq-wm6x-6qx7

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