CVE-2026-51883: The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path…

Summary

CVE-2026-51883 affects the knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0 and 0.3.1. An attacker can inject path traversal sequences such as `..\` into the `knowledge_base_name` parameter, writing knowledge base content to arbitrary locations outside the configured knowledge base root directory.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

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