CVE-2025-6853: chatchat-space Langchain-Chatchat Backend upload_temp_docs path traversal

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-06-29 · updated 2026-06-17
Weakness: CWE-22

Description

A vulnerability classified as critical has been found in chatchat-space Langchain-Chatchat up to 0.3.1. This affects the function upload_temp_docs of the file /knowledge_base/upload_temp_docs of the component Backend. The manipulation of the argument flag leads to path traversal. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

Affected products

chatchat-space Langchain-Chatchat: through 0.3.1

References

https://github.com/chatchat-space/Langchain-Chatchat/issues/5352
https://vuldb.com/?ctiid.314325
https://vuldb.com/?id.314325
https://vuldb.com/?submit.601155
https://github.com/chatchat-space/Langchain-Chatchat/issues/5352

Get alerted when CVE-2025-6853 or the next vulnerability affects your stack