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Vulnerability · Published May 5, 2026 · Assigned by VulDB

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

Low 2.6

In plain English

A low-severity broken cryptography in Langchain-Chatchat from chatchat-space. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)2.6Low
Exploit odds (30 days)0.1%top 96.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIlangchain-chatchatno fix listedGHSA-wmvv-fhm6-w34x
PyPIlangchain-chatchatno fix listedPYSEC-2026-2558

Affected products (as reported)

VendorProductVersions
chatchat-space Langchain-Chatchat 0.3.1.00.3.1.10.3.1.20.3.1.3

Weakness: CWE-328, CWE-327 · Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

References