Path Traversal Vulnerability in Langchain-Chatchat Backend by chatchat-space
CVE-2025-6853

5.3MEDIUM

Key Information:

Vendor: Chatchat-space
Status: Langchain-chatchat
Vendor: CVE Published:; 29 June 2025

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👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6853?

A path traversal vulnerability has been identified in the Langchain-Chatchat Backend, specifically within the upload_temp_docs function. This issue arises when the manipulation of the argument flag allows an attacker to gain unauthorized access to restricted directories. The vulnerability is exploitable remotely, posing a serious risk if left unaddressed. It is crucial for users and administrators of affected versions to implement mitigations and apply the latest updates to secure their systems against potential exploitation.

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Affected Version(s)

Langchain-Chatchat 0.3.0

Langchain-Chatchat 0.3.1

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-2025-6853 - Proof of Concept