Arbitrary file write via artifact filename traversal
Published Apr 7, 2026 · Updated Apr 7, 2026
Path traversal in LibreChat before 0.8.4 allows remote authenticated users to write arbitrary files through execute_code artifacts. The processCodeOutput path prefixes the untrusted artifact name with a file identifier, then the local storage backend joins that unsanitized value to the upload directory and writes it with fs.writeFileSync. Exploitation requires execute_code access, attacker-controlled artifact content and filename, and the default local file strategy; successful writes run with the server user's filesystem permissions.
Summary
What happened
Path traversal in LibreChat before 0.8.4 allows remote authenticated users to write arbitrary files through execute_code artifacts. The processCodeOutput path prefixes the untrusted artifact name with a file identifier, then the local storage backend joins that unsanitized value to the upload directory and writes it with fs.writeFileSync. Exploitation requires execute_code access, attacker-controlled artifact content and filename, and the default local file strategy; successful writes run with the server user's filesystem permissions.
The record
- CVE
- CVE-2026-34371
- Published
- Apr 7, 2026
- Updated
- Apr 7, 2026
- Vendor
- Danny Avila
- Product
- LibreChat
- Classifications
- CWE-22, T1565.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 7, 2026CVE publishedPublication date reported by the CVE source.
- Apr 7, 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=< 0.8.4
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
- GHSA-qrm5-r67f-6692 proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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