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5.9 Medium

CVE-2026-112950 Vitest is a Vite-native testing framework for JavaScript and TypeScript projects

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.

Affected products and versions

Product Affected versions Fixed in
vitest 5.0 5.0.0-rc.2 → < 5.0.3 5.0.3
vitest 4.1 4.1.11 → < 4.1.12 4.1.12
mocker 5.0 5.0.0-rc.2 → < 5.0.3 5.0.3
mocker 4.1 4.1.11 → < 4.1.12 4.1.12

References

Timeline

  1. Published
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Other CVEs of vitest

The 10 CVEs of vitest →
CVE-2026-112949 Vitest is a Vite-native testing framework for JavaScript and TypeScript projects 4.7 Medium CVE-2026-112948 Vitest is a testing framework powered by Vite 6.5 Medium CVE-2026-84373 Vitest is a testing framework powered by Vite 5.9 Medium CVE-2026-73653 Vitest is a testing framework powered by Vite 9.4 Critical
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