CVE-2026-47429

CRITICALPre-NVD 9.89.8
EchelonGraph scoreLOW confidence

This critical-severity CVE scores 9.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 54% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(low)
EPSS
59.6%
KEV
Not listed

Published

June 1, 2026

Last Modified

July 15, 2026

Advisory Details (7)

Auto-updated Jul 14, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_pr, github_commit.
github_release Patch Available

v4.1.0

Patch available: vitest-dev/vitest v4.1.0

https://github.com/vitest-dev/vitest/releases/tag/v4.1.0
github_release Patch Available

v3.2.5

Patch available: vitest-dev/vitest v3.2.5

https://github.com/vitest-dev/vitest/releases/tag/v3.2.5
github_commit Patch Available

commit af88b1f5d828 (vitest-dev/vitest)

Patch available: vitest-dev/vitest v3.2.5 (contains commit af88b1f5d828)

https://github.com/vitest-dev/vitest/commit/af88b1f5d82844a4761ea9a977156c98e2b14ca8
github_commit Patch Available

commit 20e00ef7808d (vitest-dev/vitest)

Patch available: vitest-dev/vitest v4.1.0-beta.3 (contains commit 20e00ef7808d)

https://github.com/vitest-dev/vitest/commit/20e00ef7808de6d330c5e2fda530f686e08f1c8d
github_pr Patch Available

feat(api): add `allowWrite` and `allowExec` options to `api`

Patch available: vitest-dev/vitest v4.1.0-beta.3 (PR #9350 merged 2026-01-29)

https://github.com/vitest-dev/vitest/pull/9350
github_pr Patch Available

feat(api): add `allowWrite` and `allowExec` options to `api` [backport to v3]

Patch available: vitest-dev/vitest v3.2.5 (PR #10445 merged 2026-05-28)

https://github.com/vitest-dev/vitest/pull/10445
github Patch Available🟡 PoC Available

Arbitrary file can be read and executed when Vitest UI server is listening · Advisory · vitest-dev/vitest · GitHub

https://github.com/vitest-dev/vitest/security/advisories/GHSA-5xrq-8626-4rwp

Vendor Advisories for CVE-2026-47429(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
vitest—3.2.6—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 66× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 154 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
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  48. 2026-06-14 23:18 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-47429?
CVE-2026-47429 is a critical vulnerability published on June 1, 2026. 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…
When was CVE-2026-47429 disclosed?
CVE-2026-47429 was first published in the National Vulnerability Database on June 1, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47429 actively exploited?
CVE-2026-47429 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47429?
CVE-2026-47429 has a CVSS v3 base score of 9.8 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-47429?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47429, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-47429

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