CVE-2026-51883

critical · 9.1

The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal. An attacker can inject path traversal sequences (such as `..\`) into the `knowledge_base_name` parameter to write knowledge base content to arbitrary locations outside the configured knowledge base root directory.

9.1

CVSS

0.4%

EPSS (exploit prob.)

37th

EPSS percentile

2026-10-01

Published

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

Weaknesses

CWE-22

References

https://gist.github.com/Ro1ME/30f5139a2920bf7075299a33eb1690f2
https://github.com/chatchat-space/Langchain-Chatchat/issues/5467
https://github.com/chatchat-space/Langchain-Chatchat/issues/5467

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-51883