CVE-2026-51883

Description

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.

References

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