Vulnerability Description
Vitest is a Vite-native testing framework for JavaScript and TypeScript projects. From 4.1.11 until 4.1.12 and 5.0.3, isFileLoadingAllowed and the filesystem read interpret backslashes differently on Windows in packages/mocker/src/node/interceptorPlugin.ts. When a client can reach the Vite dev server on Windows and register a redirect mock containing backslash traversal, POSIX joining preserves a Windows backslash traversal that the later filesystem read interprets as a path separator, so the client can read a file outside server.fs.allow that the Vitest process can access. This issue is fixed in versions 4.1.12 and 5.0.3.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/vitest-dev/vitest/commit/15cc006aa9f8683dc5f7e895d011fa7dc751
- https://github.com/vitest-dev/vitest/commit/b825313243dc55757e8d7c0f9e7a792135e1
- https://github.com/vitest-dev/vitest/releases/tag/v4.1.12
- https://github.com/vitest-dev/vitest/releases/tag/v5.0.3
- https://github.com/vitest-dev/vitest/security/advisories/GHSA-xp26-3454-mjgp
- https://github.com/vitest-dev/vitest/security/advisories/GHSA-xp26-3454-mjgp
FAQ
What is CVE-2026-112950?
CVE-2026-112950 is a vulnerability with a CVSS score of 5.9 (MEDIUM). Vitest is a Vite-native testing framework for JavaScript and TypeScript projects. From 4.1.11 until 4.1.12 and 5.0.3, isFileLoadingAllowed and the filesystem read interpret backslashes differently on ...
How severe is CVE-2026-112950?
CVE-2026-112950 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-112950?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.