Langchain-Chatchat Uses a Broken or Risky Cryptographic Algorithm
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.
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-2026-7845
- https://github.com/chatchat-space/Langchain-Chatchat/issues/5462
- https://github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-1-tobytes-Hash-Collision.md
- https://github.com/chatchat-space/Langchain-Chatchat
- https://vuldb.com/submit/807794
- https://vuldb.com/vuln/361124
- https://vuldb.com/vuln/361124/cti
- https://pypi.org/project/langchain-chatchat
- https://github.com/advisories/GHSA-wmvv-fhm6-w34x
- CVSS vector
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-327- Platform
- Python (PyPI)
- Package
langchain-chatchat- Disclosed
- 05.05.2026
- Updated
- 11.10.2026 14:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-2558 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-wmvv-fhm6-w34x - 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
-
Langchain-Chatchat Uses a Broken or Risky Cryptographic Algorithm this entry
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