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CVE-2026-112950

CVE-2026-112950 · Vitest: Windows backslash traversal bypasses the @vitest/mocker redirect allowlist fix

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 5.9 · Medium · EPSS 0.4% · Public exploit · Fix available

Published
Updated

Stack: node

Affected products and versions

  • vitest

    Versions
    • >= 4.1.11, < 4.1.12: Affected
    • >= 5.0.0-rc.2, < 5.0.3: Affected

    No fix published

  • mocker

    Versions
    • >= 4.1.11, < 4.1.12: Affected
    • >= 5.0.0-rc.2, < 5.0.3: Affected

    No fix published

  • @vitest/mocker npm

    Affected ranges
    • SEMVER: ≥ 4.1.11, < 4.1.12

    Update to 4.1.12

  • @vitest/mocker npm

    Affected ranges
    • SEMVER: ≥ 5.0.0-rc.2, < 5.0.3

    Update to 5.0.3

Original sources

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