CVE-2026-7845 chatchat-space Langchain-Chatchat Vision Chat Paste Image dialogue.py PIL.Image.tobytes weak hash
An attacker on the local network can exploit weak hashing in image processing to bypass security checks in Langchain-Chatchat.
- 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-2026-7845?
CVE-2026-7845 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 flaw has been found in chatchat-space Langchain-Chatchat up to 0.3.1.3. This issue affects the function PIL.Image.tobytes of the file libs/chatchat-server/chatchat/webui_pages/dialogue/dialogue.py of the component Vision Chat Paste Image Handler. This manipulation of the argument paste_image.image_data causes use of weak hash. The attacker needs to be present on the local network. The attack is considered to have high complexity. The exploitability is assessed as difficult. The exploit has been published 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-2026-7845?
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-2026-7845?
No fix has been published for CVE-2026-7845 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-7845 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7845 exists.
Sources
Also known as GHSA-wmvv-fhm6-w34x, PYSEC-2026-2558.