Langchain-Chatchat has a Race Condition in its OpenAI-Compatible File Upload API
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | langchain-chatchat | <= 0.3.1.3 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-7846
- https://github.com/chatchat-space/Langchain-Chatchat/issues/5463
- https://github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-2-Silent-File-Overwrite.md
- https://github.com/chatchat-space/Langchain-Chatchat
- https://vuldb.com/submit/807795
- https://vuldb.com/vuln/361125
- https://vuldb.com/vuln/361125/cti
- https://pypi.org/project/langchain-chatchat
- https://github.com/advisories/GHSA-x229-w2j4-h748
- CVSS vector
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-362- Platform
- Python (PyPI)
- Package
langchain-chatchat- Disclosed
- 05.05.2026
- Updated
- 11.10.2026 14:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-2559 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-x229-w2j4-h748 - CC BY 4.0
Vulnerability history: langchain-chatchat
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 06.2025 05.2026
- Without a fix
- 6
- Exploited in attacks
- 0
Severity breakdown
- Low 6
Disclosures per year
- 2025: 3
- 2026: 3
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Langchain-Chatchat has a Race Condition in its OpenAI-Compatible File Upload API this entry
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