Path Traversal in @Vitest Mocker
CVE-2026-112950
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- @Vitest Mocker — versions >= 4.1.11, < 4.1.12, >= 5.0.0-rc.2, < 5.0.3
- Vitest-Dev Vitest — versions >= 4.1.11, < 4.1.12, >= 5.0.0-rc.2, < 5.0.3
Weakness classification (CWE)
References
- github.com/vitest-dev/vitest/security/advisories/GHSA-xp26-3454-mjgp
- github.com/vitest-dev/vitest/commit/15cc006aa9f8683dc5f7e895d011fa7dc751ce35
- github.com/vitest-dev/vitest/commit/b825313243dc55757e8d7c0f9e7a792135e13473
- github.com/vitest-dev/vitest/releases/tag/v4.1.12
- github.com/vitest-dev/vitest/releases/tag/v5.0.3
Frequently asked questions
- What is CVE-2026-112950?
- CVE-2026-112950 is a medium-severity vulnerability in @Vitest Mocker, classified under Path Traversal. CVSS score: 5.9/10. Published 2026-10-20.
- How severe is CVE-2026-112950?
- Medium severity. CVSS v3 base score is 5.9 out of 10.