GHSA-5r97-79vw-qvm4 — medium GitHub Advisory in nuget/directxtk12_desktop

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.

Basic information

Type: reviewed
Severity: medium
Advisory on GitHub: Open advisory ↗
Repository advisory: Open repository advisory ↗
Source code: Browse source ↗
Published (advisory): 2026-05-18 15:38:59 UTC
Updated: 2026-05-18 15:39:00 UTC
GitHub reviewed: 2026-05-18 15:38:59 UTC

CVSS Scores

Base score	Version	Severity	Vector
6.9	4.0	—	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network. Attack complexity (AC:L) Exploitation conditions are straightforward and stable. Attack requirements (AT:N) No additional preconditions are required beyond normal reachability. Privileges required (PR:N) No privileges are required. User interaction (UI:N) No user interaction is required. Vulnerable system confidentiality impact (VC:L) Limited confidentiality impact on the vulnerable system. Vulnerable system integrity impact (VI:L) Limited integrity impact on the vulnerable system. Vulnerable system availability impact (VA:L) Limited availability impact on the vulnerable system. Subsequent system confidentiality impact (SC:N) No confidentiality impact on subsequent systems. Subsequent system integrity impact (SI:N) No integrity impact on subsequent systems. Subsequent system availability impact (SA:N) No availability impact on subsequent systems.

Identifiers

Type	Value
GHSA	GHSA-5r97-79vw-qvm4 ↗

CWEs

CWE id	Name
CWE-190	Integer Overflow or Wraparound

Affected packages (2)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
nuget	directxtk12_desktop_win10	< 2026.4.1.1	2026.5.8.1	—
nuget	directxtk12_uwp	< 2026.4.1.1	2026.5.8.1	—

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