CVE-2026-109475: .NET stack-based buffer overflow denial of service

CVE-2026-109475 · Severity: high · CVSS 7.5 · Published 2026-11-10

Microsoft .NET, a framework used to build and run applications across Windows and Linux, contains a stack-based buffer overflow vulnerability that allows an attacker to crash affected applications over the network. An exploit could lead to application downtime or loss of service availability for organizations relying on .NET applications.

Technologies: Microsoft .Net, 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), Microsoft.NetCore.App.Runtime.osx-arm64 (NuGet), Microsoft.NetCore.App.Runtime.osx-x64 (NuGet). Vendors: Microsoft, NuGet.

Quick answers

Is CVE-2026-109475 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-109475 being exploited in the wild.
How severe is CVE-2026-109475?
High severity, with a CVSS score of 7.5, published 10 November 2026.
Which products and versions are affected?
Microsoft.NetCore.App.Runtime.linux-arm (NuGet) >= 8.0.0-0, <= 8.0.33, ECOSYSTEM:introduced=8.0.0-0,fixed=8.0.34; Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet) >= 8.0.0-0, <= 8.0.33, ECOSYSTEM:introduced=8.0.0-0,fixed=8.0.34; Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet) >= 8.0.0-0, <= 8.0.33, ECOSYSTEM:introduced=8.0.0-0,fixed=8.0.34; Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet) >= 8.0.0-0, <= 8.0.33, ECOSYSTEM:introduced=8.0.0-0,fixed=8.0.34; and 4 more.
Is there a fix for CVE-2026-109475?
Yes. Microsoft.NetCore.App.Runtime.linux-arm (NuGet): upgrade to 8.0.34 or later; Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 8.0.34 or later; Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 8.0.34 or later; Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 8.0.34 or later; Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 8.0.34 or later; Microsoft.NetCore.App.Runtime.linux-x64 (NuGet): upgrade to 8.0.34 or later; Microsoft.NetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 8.0.34 or later; Microsoft.NetCore.App.Runtime.osx-x64 (NuGet): upgrade to 8.0.34 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-109475 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-109475?
Check whether you run Microsoft .Net, Microsoft.NetCore.App.Runtime.linux-arm (NuGet), Microsoft.NetCore.App.Runtime.linux-arm64 (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 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-arm --version 8.0.34
  • Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-arm64 --version 8.0.34
  • Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm --version 8.0.34
  • Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm64 --version 8.0.34
  • Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-x64 --version 8.0.34
  • Microsoft.NetCore.App.Runtime.linux-x64 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-x64 --version 8.0.34
  • Microsoft.NetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.osx-arm64 --version 8.0.34
  • Microsoft.NetCore.App.Runtime.osx-x64 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.osx-x64 --version 8.0.34

Technical details

A stack-based buffer overflow exists in .NET that can be triggered over the network to cause a denial of service. The vulnerability requires no authentication and is reachable remotely, making it accessible to unauthenticated attackers on the network. Successful exploitation results in application crash or service denial.

Affected products

  • Microsoft .NET

Identifiers

  • CVE-2026-109475
  • GHSA-3g4v-f5gv-c7xf

Timeline

  • 2026-11-10: disclosed

References

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