CVE-2026-114159: Microsoft Visual Studio heap-based buffer overflow

CVE-2026-114159 · Severity: high · CVSS 8.8 · Published 2026-11-10

Visual Studio, Microsoft's development environment, contains a heap-based buffer overflow vulnerability that allows an attacker to execute arbitrary code by sending specially crafted network traffic. An attacker can exploit this remotely without authentication to gain control of a developer's machine or build server, potentially compromising source code, intellectual property, and the entire software supply chain.

Technologies: Microsoft Visual Studio, 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-2026-114159 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-114159 being exploited in the wild.
How severe is CVE-2026-114159?
High severity, with a CVSS score of 8.8, published 10 November 2026.
Which products and versions are affected?
Microsoft.NetCore.App.Runtime.win-arm64 (NuGet) >= 8.0.0, < 8.0.34, ECOSYSTEM:introduced=8.0.0,fixed=8.0.34; Microsoft.NetCore.App.Runtime.win-x64 (NuGet) >= 8.0.0, < 8.0.34, ECOSYSTEM:introduced=8.0.0,fixed=8.0.34; Microsoft.NetCore.App.Runtime.win-x86 (NuGet) >= 8.0.0, < 8.0.34, ECOSYSTEM:introduced=8.0.0,fixed=8.0.34.
Is there a fix for CVE-2026-114159?
Yes. Microsoft.NetCore.App.Runtime.win-arm64 (NuGet): upgrade to 8.0.34 or later; Microsoft.NetCore.App.Runtime.win-x64 (NuGet): upgrade to 8.0.34 or later; Microsoft.NetCore.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-2026-114159 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-114159?
Check whether you run Microsoft Visual Studio, Microsoft.NetCore.App.Runtime.win-arm64 (NuGet), Microsoft.NetCore.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.NetCore.App.Runtime.win-arm64 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-arm64 --version 8.0.34
  • Microsoft.NetCore.App.Runtime.win-x64 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-x64 --version 8.0.34
  • Microsoft.NetCore.App.Runtime.win-x86 (NuGet): upgrade to 8.0.34 or later
    dotnet add package Microsoft.NetCore.App.Runtime.win-x86 --version 8.0.34

Technical details

A heap-based buffer overflow in Visual Studio allows an unauthenticated remote attacker to execute arbitrary code over the network. The vulnerability exists in memory handling logic and can be triggered via network communication; user interaction may be required depending on the attack vector. Successful exploitation results in code execution with the privileges of the Visual Studio process.

Affected products

  • Microsoft Visual Studio

Identifiers

  • CVE-2026-114159
  • GHSA-3cgx-w6gm-fqrx

Timeline

  • 2026-11-10: disclosed

References

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