Arbitrary file read via unchecked redirect path
Published Sep 1, 2026 · Updated Sep 2, 2026
Path traversal in Vitest and @vitest/mocker 2.1.0 through 4.1.10 and 5.0.0-beta.1 through 5.0.0-rc.1 allows remote attackers to read local files. The interceptorPlugin register handler joins an opaque redirect URL's preserved .. segments to the project root without applying Vite's file-serving allowlist, and its load hook returns the resolved file as module source. Unauthenticated exploitation requires a reachable, nondefault exposed development server using the public mockerPlugin or standalone interceptorPlugin; browser mode instead requires its per-run token, and the bounded consequence is disclosure of files readable by the server process.
Summary
What happened
Path traversal in Vitest and @vitest/mocker 2.1.0 through 4.1.10 and 5.0.0-beta.1 through 5.0.0-rc.1 allows remote attackers to read local files. The interceptorPlugin register handler joins an opaque redirect URL's preserved .. segments to the project root without applying Vite's file-serving allowlist, and its load hook returns the resolved file as module source. Unauthenticated exploitation requires a reachable, nondefault exposed development server using the public mockerPlugin or standalone interceptorPlugin; browser mode instead requires its per-run token, and the bounded consequence is disclosure of files readable by the server process.
The record
- CVE
- CVE-2026-84373
- Published
- Sep 1, 2026
- Updated
- Sep 2, 2026
- Vendor
- VoidZero
- Product
- Vitest
- Classifications
- CWE-22, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 1, 2026CVE publishedPublication date reported by the CVE source.
- Sep 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 2.1.0, < 4.1.11
- Affected versionversion=>= 5.0.0-beta.1, < 5.0.0-rc.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream redirect-traversal regression testproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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