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.

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)

Published 2026-07-14 · last modified 2026-08-06.

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.

EPSS exploit prediction

EPSS: 0.009 (57.8th percentile), scored 2026-10-12.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: -0.000

Affected products

Vitest-Dev Vitest — versions < 3.2.5, >= 4.0.0, < 4.1.0
Vitest.dev Vitest

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

az9713/cve-lite-on-pi

References

github.com/vitest-dev/vitest/security/advisories/GHSA-5xrq-8626-4rwp (Exploit, Mitigation, Vendor Advisory)
github.com/vitest-dev/vitest/pull/10445 (Exploit, Patch, Issue Tracking)
github.com/vitest-dev/vitest/pull/9350 (Exploit, Patch, Issue Tracking)
github.com/vitest-dev/vitest/commit/20e00ef7808de6d330c5e2fda530f686e08f1c8d (Patch)
github.com/vitest-dev/vitest/commit/af88b1f5d82844a4761ea9a977156c98e2b14ca8 (Patch)
github.com/vitest-dev/vitest/releases/tag/v3.2.5 (Release Notes)
github.com/vitest-dev/vitest/releases/tag/v4.1.0 (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.