CVE-2026-114157: Microsoft ASP.NET Core race condition privilege escalation

CVE-2026-114157 · Severity: high · CVSS 7.5 · Published 2026-11-10

ASP.NET Core, a framework that hosts web applications, contains a race condition flaw in how it manages concurrent requests. An authorized attacker with local access to a system running the affected version can exploit this timing vulnerability to elevate their privileges, potentially gaining administrative control.

Technologies: Microsoft Asp.Net Core, 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-2026-114157 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-114157 being exploited in the wild.
How severe is CVE-2026-114157?
High severity, with a CVSS score of 7.5, published 10 November 2026.
Which products and versions are affected?
Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet) >= 8.0.0-preview.1.23112.2, <= 8.0.33, ECOSYSTEM:introduced=8.0.0-preview.1.23112.2,fixed=8.0.34; Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet) >= 8.0.0-preview.1.23112.2, <= 8.0.33, ECOSYSTEM:introduced=8.0.0-preview.1.23112.2,fixed=8.0.34; Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet) >= 8.0.0-preview.1.23112.2, <= 8.0.33, ECOSYSTEM:introduced=8.0.0-preview.1.23112.2,fixed=8.0.34.
Is there a fix for CVE-2026-114157?
Yes. Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 8.0.34 or later; Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 8.0.34 or later; Microsoft.AspNetCore.App.Runtime.win-x86 (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-2026-114157 attacked?
It is attacked with local access, in a software library.
Am I affected by CVE-2026-114157?
Check whether you run Microsoft Asp.Net Core, Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet), Microsoft.AspNetCore.App.Runtime.win-x64 (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.win-arm64 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.win-arm64 --version 8.0.34
  • Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.win-x64 --version 8.0.34
  • Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.win-x86 --version 8.0.34

Technical details

A race condition in ASP.NET Core's shared resource synchronization allows improper concurrent execution, enabling an authorized local attacker to achieve privilege escalation. The vulnerability requires the attacker to already have some level of system access. A fix has been released by Microsoft.

Affected products

  • Microsoft ASP.NET Core

Identifiers

  • CVE-2026-114157
  • GHSA-7phj-vgxq-r67h

Timeline

  • 2026-11-10: disclosed

References

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