CVE-2026-114154: Microsoft ASP.NET Core denial of service via resource consumption

CVE-2026-114154 · Severity: high · CVSS 7.5 · Published 2026-11-10

ASP.NET Core, a framework used to build web applications, is vulnerable to a denial-of-service attack that allows an unauthenticated attacker to overwhelm and crash the application by consuming excessive system resources. An exploit would cause web applications to become unavailable to legitimate users.

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), Microsoft.AspNetCore.Server.HttpSys (NuGet). Vendors: Microsoft, NuGet.

Quick answers

Is CVE-2026-114154 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-114154 being exploited in the wild.
How severe is CVE-2026-114154?
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, <= 8.0.33, ECOSYSTEM:introduced=8.0.0,fixed=8.0.34; Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet) >= 8.0.0, <= 8.0.33, ECOSYSTEM:introduced=8.0.0,fixed=8.0.34; Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet) >= 8.0.0, <= 8.0.33, ECOSYSTEM:introduced=8.0.0,fixed=8.0.34; Microsoft.AspNetCore.Server.HttpSys (NuGet) = 2.3.10, ECOSYSTEM:introduced=2.3.10,fixed=2.3.14.
Is there a fix for CVE-2026-114154?
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; Microsoft.AspNetCore.Server.HttpSys (NuGet): upgrade to 2.3.14 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-114154 attacked?
It is attacked over the network.
Am I affected by CVE-2026-114154?
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
  • Microsoft.AspNetCore.Server.HttpSys (NuGet): upgrade to 2.3.14 or later
    dotnet add package Microsoft.AspNetCore.Server.HttpSys --version 2.3.14

Technical details

An uncontrolled resource consumption vulnerability in ASP.NET Core permits an unauthenticated network attacker to trigger a denial of service. The vulnerability requires no user interaction or prior authentication. A successful exploit exhaust server resources and renders the application unavailable.

Affected products

  • Microsoft ASP.NET Core

Identifiers

  • CVE-2026-114154
  • GHSA-3893-7fxc-qvff

Timeline

  • 2026-11-10: disclosed

References

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