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

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

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…

Read on GitHub Advisory Database

On 10/22/2026, 04:48 AM, GitHub Advisory Database published "Vitest: Windows backslash traversal bypasses the @vitest/mocker redirect allowlist fix" (type: Advisory). Severity is "Medium" (medium). Related technologies: JavaScript / Node.js, GitHub. CVE: CVE-2026-112950.