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GHSA-5r97-79vw-qvm4 — directxtk12_desktop_win10

Fix: microsoft/DirectXTK12@c037a02

GHSA-5r97-79vw-qvm4 is a remote code execution vulnerability in directxtk12_desktop_win10. A fix is available for directxtk12_desktop_win10 — see the affected versions and patch details below.

Microsoft DirectX12: .spritefont multiply overflow only in 32-bit builds

Published
May 18, 2026
Updated
May 18, 2026
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of May 18, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

2 pkgs affected
.NETdirectxtk12_desktop_win10.NETdirectxtk12_uwp

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

Impact

The spritefont reader can be induced to perform a 32-bit overflow multiply that could in theory result in a RCE.

This impacts the use of the DirectX Tool Kit SpriteFont class file loading ctor if given untrusted data files.

Note this only applies to x86/ARM builds of the library. ARM64 and x64 native is not subject to this issue.

Patches

This bug has been fixed in the May 7, 2026 release. Alternatively, you can just update your copy of the reader as per this commit.

Workarounds

This does not apply if a project's .spritefont files are all 'trusted' data that were included with an application. It's primarily an issue only if developers are using user-provided or network downloaded spritefont files.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetdirectxtk12_desktop_win10all versions2026.5.8.1dotnet add package directxtk12_desktop_win10 --version 2026.5.8.1
.NETNuGetdirectxtk12_uwpall versions2026.5.8.1dotnet add package directxtk12_uwp --version 2026.5.8.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for directxtk12_desktop_win10, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update directxtk12_desktop_win10 to 2026.5.8.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5r97-79vw-qvm4 is resolved across your whole dependency graph.

  3. Workarounds

    Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.

Frequently Asked Questions

### Impact The spritefont reader can be induced to perform a 32-bit overflow multiply that could in theory result in a RCE. This impacts the use of the *DirectX Tool Kit* **SpriteFont** class file loading ctor if given untrusted data files. > Note this only applies to x86/ARM builds of the library. ARM64 and x64 native is not subject to this issue. ### Patches This bug has been fixed in the May 7, 2026 release. Alternatively, you can just update your copy of the reader as per [this commit](https://github.com/microsoft/DirectXTK12/commit/c037a024a7ed3b2162fa2bbbe209b84ba2904494). ### Workar
O3 Security · Impact-Aware SCA

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GHSA-5r97-79vw-qvm4: directxtk12_desktop | O3 Security