| Component | LangChain |
| Severity | low (CVSS 2.6) |
| CVSS vector | CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N |
| Published (NVD) | 2026-05-05 |
| Last modified | 2026-07-24 |
| Affected versions | <= 0.3.1.3 read from the advisory text: NVD has not published CPE data yet |
| Fixed in | see the vendor advisory |
| Weakness | CWE-362CWE-367 |
| CISA KEV | not listed |
NVD description
A vulnerability has been found in chatchat-space Langchain-Chatchat up to 0.3.1.3. Impacted is the function files of the file libs/chatchat-server/chatchat/server/api_server/openai_routes.py of the component OpenAI-Compatible File Upload API. Such manipulation of the argument file.filename leads to time-of-check time-of-use. Access to the local network is required for this attack to succeed. The attack requires a high level of complexity. The exploitability is considered difficult. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
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-2026-7846
- https://github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-2-Silent-File-Overwrite.md
- https://github.com/chatchat-space/Langchain-Chatchat/
- https://github.com/chatchat-space/Langchain-Chatchat/issues/5463
- https://vuldb.com/submit/807795
- https://vuldb.com/vuln/361125
- https://vuldb.com/vuln/361125/cti
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