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

Quick assessment

Affected
vitest-dev vitest
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vitest 是一个专为 JavaScript 和 TypeScript 项目设计的原生 Vite 测试框架。在 4.1.11 至 4.1.12 以及 5.0.3 之前的版本中， 与文件系统读取功能在 中对 Windows 平台上的反斜杠（backslash）处理方式存在差异。当客户端能够访问运行在 Windows 上的 Vite 开发服务器，并注册一个包含反斜杠路径遍历的拦截重定向（redirect mock）时，POSIX 路径拼接操作会保留 Windows 风格的路径遍历特征，而后续的文件系统读取操作会将该反

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-112950

Vulnerability Information
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Vulnerability Title
Vitest: Windows backslash traversal bypasses the @vitest/mocker redirect allowlist fix
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vitest-dev vitest >= 4.1.11, < 4.1.12 -
@vitest mocker >= 4.1.11, < 4.1.12 -

II. Public POCs for CVE-2026-112950

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III. Intelligence Information for CVE-2026-112950

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Other References for CVE-2026-112950 (5)

Same Patch Batch · vitest-dev · 2026-10-20 · 3 CVEs total

CVE-2026-112948 6.5 MEDIUM Vitest: Servers misapply `server.fs.deny`, serving `.env`, private keys, `.git`, and the A
CVE-2026-112949 4.7 MEDIUM Vitest: Code injection via unauthenticated manual mock registration

IV. Related Vulnerabilities

Same product: vitest
Same vendor: vitest-dev
Same weakness: CWE-22

V. Comments for CVE-2026-112950

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