# Microsoft Visual Studio deserialization remote code execution

Source: https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-visual-studio-remote-1eb2f932  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-11  
License: CC BY 4.0 with a link back

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

Visual Studio is Microsoft's integrated development environment used by software developers. A flaw in how it handles untrusted data during deserialization allows an attacker to execute arbitrary code on a developer's machine over the network, potentially compromising the developer's system and any code or credentials stored on it.

Technologies: [Microsoft Visual Studio](https://junglewise.ai/threats/technologies/visual-studio), [Microsoft.NetCore.App.Runtime.win-x86 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-netcore-app-runtime-win-x86). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft), [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** High severity, with a CVSS score of 8.8, published 10 November 2026.

**Which products and versions are affected?** Microsoft Visual Studio affected versions via Microsoft.NETCore.App.Runtime.win-x86 8.0.0 to < 8.0.34; Microsoft.NetCore.App.Runtime.win-x86 (NuGet) >= 8.0.0, < 8.0.34, ECOSYSTEM:introduced=8.0.0.

**Is there a fix for This vulnerability?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is This vulnerability attacked?** It is attacked over the network, in a web application.

**Am I affected?** Check whether you run Microsoft Visual Studio or Microsoft.NetCore.App.Runtime.win-x86 (NuGet) 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.

## Technical details

The vulnerability is a deserialization flaw in Visual Studio that permits unauthenticated remote code execution over the network with user interaction required. An attacker can exploit this to execute arbitrary code with the privileges of the affected user. The advisory indicates this is a duplicate of another advisory (GHSA-fpxj-5c99-g7vj) and has been withdrawn; the patch status for this specific advisory is unknown.

## Affected products

- Microsoft Visual Studio affected versions via Microsoft.NETCore.App.Runtime.win-x86 8.0.0 to < 8.0.34

## Timeline

- 2026-11-10: disclosed

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