CVE-2026-118745: Microsoft Visual Studio heap buffer overflow RCE

CVE-2026-118745 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Visual Studio, a development platform used by software engineers to build applications, contains a heap-based buffer overflow vulnerability that allows a remote attacker to execute arbitrary code without authorization. An attacker can exploit this flaw over the network to gain control of the system and install malware or steal sensitive data.

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-2026-118745 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-118745 being exploited in the wild.
How severe is CVE-2026-118745?
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-2026-118745?
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-2026-118745 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-118745?
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 exists in Visual Studio that can be triggered remotely to achieve remote code execution. The vulnerability allows an unauthenticated attacker to write beyond the bounds of an allocated heap buffer, overwriting adjacent memory and potentially diverting program execution flow. Exploitation requires network access but does not require prior authentication or user interaction.

Affected products

  • Microsoft Visual Studio

Identifiers

  • CVE-2026-118745
  • GHSA-x8x8-p968-x646

Timeline

  • 2026-11-10: disclosed

References

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