CVE-2026-7846 chatchat-space Langchain-Chatchat OpenAI-Compatible File Upload API openai_routes.py files toctou
Attackers can exploit a race condition in the file upload API to bypass security checks, requiring local network access and high complexity.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-7846?
CVE-2026-7846 is a low-severity vulnerability in chatchat-space Langchain-Chatchat, published on 5 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-7846?
3 open source packages ship an affected version, including langchain-chatchat.
| Package | Affected | Fixed in |
|---|---|---|
langchain-chatchat PyPI | All versions to 0.3.1.3 | None |
langchain-chatchat PyPI | All versions to 0.3.1.3 | None |
langchain-chatchat PyPI | All versions to 0.3.1.3 | None |
How do I fix CVE-2026-7846?
No fix has been published for CVE-2026-7846 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-7846 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7846 exists.
Sources
Also known as GHSA-x229-w2j4-h748, PYSEC-2026-2559.