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

- 種別: advisory
- 重大度: medium
- 関連技術: nodejs, github
- CVE: CVE-2026-112950
- 公開日時: 2026-10-21T19:48:38.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-xp26-3454-mjgp)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-xp26-3454-mjgp

影響: npm:@vitest/mocker >= 4.1.11, < 4.1.12 → 4.1.12, npm:@vitest/mocker >= 5.0.0-rc.2, < 5.0.3 → 5.0.3
Summary The path traversal fix released for [GHSA-82fw-gwwq-j7x9](https://github.com/vitest-dev/vitest/security/advisories/GHSA-82fw-gwwq-j7x9) can be bypassed on Windows by using a backslash in the redirect URL pathname. The fixed code joins an attacker-controlled URL pathname with the Vite root using node:path/posix, then passes that string to Vite's file allowlist check. On Windows, a value such as C:/project/root/..\secret.txt retains ..\ during the POSIX join and begins with the allowed ro…