CVE-2026-51883

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.

CVSS 3.1

9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-25)

CWE

CWE-22

Published

2026-10-01

Modified

2026-10-05

Record from

the NVD, synced 2026-10-19

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

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