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.NET
.NET NuGet
Not in CISA KEV
HIGH severity

CVE-2026-50646

HIGH

CVE-2026-50646 is a high-severity (CVSS 7.8) Deserialization of Untrusted Data vulnerability in Microsoft.WindowsDesktop.App.Runtime.win-x64. O3 Security confirms whether CVE-2026-50646 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Microsoft Security Advisory CVE-2026-50646 – .NET Remote Code Execution Vulnerability

Also known asBIT-dotnet-2026-50646BIT-dotnet-sdk-2026-50646GHSA-gh2h-rhph-h37g
Published
Jul 14, 2026
Updated
Sep 8, 2026
Affected
9 pkgs
Patched
9 / 9
Exploits
None indexed
Exploitation data as of Sep 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

9 pkgs affected
.NETMicrosoft.WindowsDesktop.App.Runtime.win-x64.NETMicrosoft.WindowsDesktop.App.Runtime.win-x86.NETMicrosoft.WindowsDesktop.App.Runtime.win-arm64.NETMicrosoft.WindowsDesktop.App.Runtime.win-x64.NETMicrosoft.WindowsDesktop.App.Runtime.win-x86.NETMicrosoft.WindowsDesktop.App.Runtime.win-arm64.NETMicrosoft.WindowsDesktop.App.Runtime.win-x64.NETMicrosoft.WindowsDesktop.App.Runtime.win-x86+1 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

Protection mechanism failure in .NET Framework allows an unauthorized attacker to execute code locally.

Affected Packages

9 total 9 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetMicrosoft.WindowsDesktop.App.Runtime.win-x6410.0.0&&< 10.0.1010.0.10
.NETNuGetMicrosoft.WindowsDesktop.App.Runtime.win-x8610.0.0&&< 10.0.1010.0.10
.NETNuGetMicrosoft.WindowsDesktop.App.Runtime.win-arm6410.0.0&&< 10.0.1010.0.10
.NETNuGetMicrosoft.WindowsDesktop.App.Runtime.win-x649.0.0&&< 9.0.189.0.18
.NETNuGetMicrosoft.WindowsDesktop.App.Runtime.win-x869.0.0&&< 9.0.189.0.18
.NETNuGetMicrosoft.WindowsDesktop.App.Runtime.win-arm649.0.0&&< 9.0.189.0.18

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Microsoft.WindowsDesktop.App.Runtime.win-x64. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update Microsoft.WindowsDesktop.App.Runtime.win-x64 to 10.0.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-50646 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2026-50646 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2026-50646. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Protection mechanism failure in .NET Framework allows an unauthorized attacker to execute code locally.
O3 Security · Impact-Aware SCA

Is CVE-2026-50646 in your dependencies?

O3 detects CVE-2026-50646 across NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

CVE-2026-50646: Microsoft.WindowsDesktop.… | O3 Security