Path Traversal Vulnerability in Langchain-Chatchat Affects chatchat-space
CVE-2025-6855

5.1MEDIUM

Key Information:

Vendor

Chatchat-space

Status
Langchain-chatchat
Vendor
CVE Published:
29 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6855?

A path traversal vulnerability has been identified in the Langchain-Chatchat product from chatchat-space. This issue arises from improper processing of file input at the endpoint /v1/file, where manipulation of the argument flag can allow unauthorized file access beyond the intended directory. Due to the public disclosure of this vulnerability, it poses a significant risk, enabling potential exploitation by malicious users seeking to gain unauthorized access to sensitive files on the system.

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-2025-6855 - Proof of Concept

References

https://vuldb.com/?id.314327
vdb-entrytechnical-description
https://vuldb.com/?ctiid.314327
signaturepermissions-required
https://vuldb.com/?submit.601162
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-6855 : Path Traversal Vulnerability in Langchain-Chatchat Affects chatchat-space