What’s Vulnerable › Vulnerabilities

CVE-2026-7845: chatchat-space Langchain-Chatchat Vision Chat Paste Image dialogue.py PIL.Image.tobytes weak hash

• Severity: low (CVSS 2.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-05 · updated 2026-07-24
• Weakness: CWE-327

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.

Affected products

• chatchat-space Langchain-Chatchat: 0.3.1.0, 0.3.1.1, 0.3.1.2, 0.3.1.3

References

• https://github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-1-tobytes-Hash-Collision.md
• https://github.com/chatchat-space/Langchain-Chatchat/
• https://github.com/chatchat-space/Langchain-Chatchat/issues/5462
• https://vuldb.com/submit/807794
• https://vuldb.com/vuln/361124
• https://vuldb.com/vuln/361124/cti
• https://github.com/chatchat-space/Langchain-Chatchat/issues/5462

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