Weak Hash Vulnerability in Langchain-Chatchat Product by chatchat-space
CVE-2026-7845

2.1LOW

Key Information:

Vendor: Chatchat-space
Status: Langchain-chatchat
Vendor: CVE Published:; 5 May 2026

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👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7845?

A vulnerability has been identified in Langchain-Chatchat affecting versions up to 0.3.1.3. This issue arises from a flaw in the Vision Chat Paste Image Handler, specifically within the function PIL.Image.tobytes. The vulnerability can be exploited through manipulation of the paste_image.image_data argument, which leads to the application using a weak hash. While this requires an attacker to be present on the local network, the exploitability has been deemed difficult. Although an issue report was submitted regarding the problem, there has been no formal response from the project maintainers.

Affected Version(s)

Langchain-Chatchat 0.3.1.0

Langchain-Chatchat 0.3.1.1

Langchain-Chatchat 0.3.1.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-7845 - Proof of Concept