Vitest: Windows backslash traversal bypasses the @vitest/mocker redirect allowlist fix

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-112950
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-20 16:17:05 UTC
Updated2026-10-20 19:56:45 UTC
DescriptionVitest 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-22 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Vitest-dev Vitest affected >= 4.1.11, < 4.1.12 Not specified
CNA Vitest-dev Vitest affected >= 5.0.0-rc.2, < 5.0.3 Not specified
CNA @vitest Mocker affected >= 4.1.11, < 4.1.12 Not specified
CNA @vitest Mocker affected >= 5.0.0-rc.2, < 5.0.3 Not specified

References

ReferenceSourceLinkTags
github.com/vitest-dev/vitest/releases/tag/v5.0.3 [email protected] github.com
github.com/vitest-dev/vitest/commit/b825313243dc55757e8d7c0f9e7a792135e1... [email protected] github.com
github.com/vitest-dev/vitest/security/advisories/GHSA-xp26-3454-mjgp [email protected] github.com
github.com/vitest-dev/vitest/releases/tag/v4.1.12 [email protected] github.com
github.com/vitest-dev/vitest/commit/15cc006aa9f8683dc5f7e895d011fa7dc751... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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