CVE-2026-114156: ASP.NET Core input validation bypass allows security feature circumvention

CVE-2026-114156 · Severity: medium · CVSS 6.5 · Published 2026-11-10

ASP.NET Core, a framework used to build web applications, contains a flaw in how it validates user input. An attacker on the network can exploit this to bypass a security feature without authentication, potentially compromising the integrity or functionality of the application.

Technologies: Microsoft Asp.Net Core, Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet), Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet), Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet), Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet), Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet), Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet), Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet), Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet), Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet), Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet), Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet). Vendors: Microsoft, NuGet.

Quick answers

Is CVE-2026-114156 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-114156 being exploited in the wild.
How severe is CVE-2026-114156?
Medium severity, with a CVSS score of 6.5, published 10 November 2026.
Which products and versions are affected?
Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) >= 11.0.0-preview.7.26381.103, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.7.26381.103,fixed=11.0.0; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) >= 11.0.0-preview.7.26381.103, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.7.26381.103,fixed=11.0.0; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet) >= 11.0.0-preview.7.26381.103, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.7.26381.103,fixed=11.0.0; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet) >= 11.0.0-preview.7.26381.103, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.7.26381.103,fixed=11.0.0; and 7 more.
Is there a fix for CVE-2026-114156?
Yes. Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 11.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-114156 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-114156?
Check whether you run Microsoft Asp.Net Core, Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet), Microsoft.AspNetCore.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.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm --version 11.0.0
  • Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm64 --version 11.0.0
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm --version 11.0.0
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 --version 11.0.0
  • Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-x64 --version 11.0.0
  • Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-x64 --version 11.0.0
  • Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.osx-arm64 --version 11.0.0
  • Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.osx-x64 --version 11.0.0
  • Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.win-arm64 --version 11.0.0
  • Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.win-x64 --version 11.0.0
  • Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 11.0.0 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.win-x86 --version 11.0.0

Technical details

The vulnerability is an improper input validation issue in ASP.NET Core that permits security feature bypass. An attacker can exploit this over the network without requiring authentication credentials. The advisory does not specify additional technical preconditions or the exact security mechanism being bypassed.

Affected products

  • Microsoft ASP.NET Core

Identifiers

  • CVE-2026-114156
  • GHSA-8w29-6cjc-h6w4

Timeline

  • 2026-11-10: disclosed

References

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