{"id":"CVE-2026-112950","sourceIdentifier":"security-advisories@github.com","published":"2026-10-20T16:17:05.807","lastModified":"2026-10-20T19:56:45.543","vulnStatus":"Awaiting Analysis","cveTags":[],"descriptions":[{"lang":"en","value":"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":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"vitest-dev","product":"vitest","versions":[{"version":">= 4.1.11, < 4.1.12","status":"affected"},{"version":">= 5.0.0-rc.2, < 5.0.3","status":"affected"}]},{"vendor":"@vitest","product":"mocker","versions":[{"version":">= 4.1.11, < 4.1.12","status":"affected"},{"version":">= 5.0.0-rc.2, < 5.0.3","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":2.2,"impactScore":3.6}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-22"}]}],"references":[{"url":"https://github.com/vitest-dev/vitest/commit/15cc006aa9f8683dc5f7e895d011fa7dc751ce35","source":"security-advisories@github.com"},{"url":"https://github.com/vitest-dev/vitest/commit/b825313243dc55757e8d7c0f9e7a792135e13473","source":"security-advisories@github.com"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v4.1.12","source":"security-advisories@github.com"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v5.0.3","source":"security-advisories@github.com"},{"url":"https://github.com/vitest-dev/vitest/security/advisories/GHSA-xp26-3454-mjgp","source":"security-advisories@github.com"}]}