CVE-2026-51884

critical · 9.8

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.

9.8

CVSS

0.6%

EPSS (exploit prob.)

49th

EPSS percentile

2026-10-01

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-22

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-51884