chatchat-space Langchain-Chatchat 0.3.0/0.3.1 knowledge_base_name path traversal

Summaryinfo

A vulnerability categorized as critical has been discovered in chatchat-space Langchain-Chatchat 0.3.0/0.3.1. Affected is an unknown function of the component Knowledge Base Creation/Document Upload Interfaces. Executing a manipulation of the argument knowledge_base_name can lead to path traversal. This vulnerability is registered as CVE-2026-51883. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in chatchat-space Langchain-Chatchat 0.3.0/0.3.1. This vulnerability affects an unknown functionality of the component Knowledge Base Creation/Document Upload Interfaces. The manipulation of the argument knowledge_base_name with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal. An attacker can inject path traversal sequences (such as `..\`) into the `knowledge_base_name` parameter to write knowledge base content to arbitrary locations outside the configured knowledge base root directory.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-51883 since 06/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/02/2026). The MITRE ATT&CK project declares the attack technique as T1006.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Chat Software

Vendor

• chatchat-space

Name

• Langchain-Chatchat

Version

• 0.3.0
• 0.3.1

Website

• Product: https://github.com/chatchat-space/Langchain-Chatchat/

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