CVE-2026-50651: Microsoft .NET denial of service via resource exhaustion

CVE-2026-50651 · Severity: high · CVSS 7.5 · Published 2026-07-14

A security vulnerability has been identified in the .NET HTTP client, a component used by developers to enable applications to communicate over the internet. An attacker can exploit this flaw to crash an application by forcing it to run out of memory. This could lead to service outages and impact the availability of business-critical applications built on .NET.

Technologies: Microsoft .NET Runtime, Microsoft Visual Studio 2022 version 17.12, 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), Microsoft.NetCore.App.Runtime.win-arm (NuGet), Microsoft.NetCore.App.Runtime.win-arm64 (NuGet), Microsoft.NetCore.App.Runtime.win-x64 (NuGet), Microsoft.NetCore.App.Runtime.win-x86 (NuGet). Vendors: Microsoft, NuGet.

Quick answers

Is CVE-2026-50651 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-50651 being exploited in the wild.
How severe is CVE-2026-50651?
High severity, with a CVSS score of 7.5, published 14 July 2026.
Which products and versions are affected?
Microsoft .NET Runtime 8.0.0 - 8.0.28, 9.0.0 - 9.0.17, 10.0.0 - 10.0.9; Microsoft Visual Studio 2022 version 17.12 17.12.0 to 17.12.22; Microsoft Visual Studio 2022 version 17.14 17.14.0 to 17.14.36; Microsoft.NetCore.App.Runtime.linux-arm (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.10; and 11 more.
Is there a fix for CVE-2026-50651?
Yes. Microsoft.NetCore.App.Runtime.linux-arm (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.linux-x64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.osx-x64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.win-arm (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.win-arm64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.win-x64 (NuGet): upgrade to 10.0.10 or later; Microsoft.NetCore.App.Runtime.win-x86 (NuGet): upgrade to 10.0.10 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-50651 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-50651?
Check whether you run Microsoft .NET Runtime, Microsoft Visual Studio 2022 version 17.12, Microsoft Visual Studio 2022 version 17.14 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 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-arm --version 10.0.10
  • Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-arm64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm --version 10.0.10
  • Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-x64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.linux-x64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.linux-x64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.osx-arm64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.osx-x64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.osx-x64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.win-arm (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-arm --version 10.0.10
  • Microsoft.NetCore.App.Runtime.win-arm64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-arm64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.win-x64 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-x64 --version 10.0.10
  • Microsoft.NetCore.App.Runtime.win-x86 (NuGet): upgrade to 10.0.10 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-x86 --version 10.0.10

Technical details

A denial of service vulnerability (CWE-770) exists in the .NET HTTP client (System.Net.Http) due to improper resource allocation limits when handling HTTP/2 traffic. A remote, unauthenticated attacker can exploit this by sending specially crafted HTTP/2 requests that trigger an out-of-memory (OOM) condition in the application process. The vulnerability affects .NET 8, 9, and 10 across all platforms and architectures. Exploitation does not require user interaction or special privileges. Microsoft has released patches in .NET versions 8.0.29, 9.0.18, and 10.0.10. Developers must update their runtimes and recompile any self-contained applications.

Affected products

  • Microsoft .NET Runtime 8.0.0 - 8.0.28, 9.0.0 - 9.0.17, 10.0.0 - 10.0.9

Identifiers

  • CVE-2026-50651
  • GHSA-wp74-jgxh-gv4q

Timeline

  • 2026-07-14: disclosed: Advisory published by Microsoft
  • 2026-07-14: patched: Patched versions released for .NET 8, 9, and 10

References

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