CVE-2026-51884

State: Published
Severity: 9.8 Critical
Published: Oct 1, 2026
Updated: Oct 5, 2026
Reserved: Jun 8, 2026

Description

The /knowledge_base/upload_temp_docs temporary document upload endpoint in Langchain Chatchat 0.3.1 is vulnerable to path traversal. By crafting malicious filenames, an attacker can write files to arbitrary locations on the server, bypassing the intended restrictions on the temporary directory.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
n/an/a	n/aAffected

References

https://github.com/chatchat-space/Langchain-Chatchat/issues/5466
https://gist.github.com/Ro1ME/da028c9ce13dd888e265b9bef01d6eca

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