Path Traversal in Vitest-Dev Vitest
CVE-2026-47429
Vitest is a testing framework powered by Vite. Prior to 3.2.5 and 4.1.0, the Vitest UI/API server on Windows used isFileServingAllowed incorrectly for /__vitest_attachment__, allowing \\?\\..\\ path traversal to read files outside the project; exposed API write and rerun features such as saveTestFile and rerun could also allow arbitrary script execution. This issue is fixed in versions 3.2.5 and 4.1.0.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.009 (57.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Vitest-dev Vitest — versions < 3.2.5, >= 4.0.0, < 4.1.0
- Vitest.dev Vitest
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Exploit, Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Exploit, Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-47429?
- CVE-2026-47429 is a critical-severity vulnerability in Vitest-Dev Vitest, classified under Path Traversal. CVSS score: 9.8/10. Published 2026-07-14.
- How severe is CVE-2026-47429?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-47429 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.