| Component | LangChain |
| Severity | medium (CVSS 5.5) |
| CVSS vector | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| Published (NVD) | 2025-06-29 |
| Last modified | 2026-06-17 |
| Affected versions | langchain-chatchat <= 0.3.1 |
| Fixed in | see the vendor advisory |
| Weakness | CWE-22 |
| CISA KEV | not listed |
NVD description
A vulnerability, which was classified as critical, has been found in chatchat-space Langchain-Chatchat up to 0.3.1. This issue affects some unknown processing of the file /v1/file. The manipulation of the argument flag leads to path traversal. The exploit has been disclosed to the public and may be used.
What to do
- NVD lists no fixed version yet: follow the vendor advisory below and keep LangChain off the public internet until a fix ships.
- Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2025-6855
- https://github.com/chatchat-space/Langchain-Chatchat/issues/5354
- https://vuldb.com/?id.314327
- https://vuldb.com/?submit.601162
- https://vuldb.com/?ctiid.314327
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