chatchat-space Langchain-Chatchat 0.3.0 File Upload /v1/files path traversal

Summaryinfo

A vulnerability classified as critical has been found in chatchat-space Langchain-Chatchat 0.3.0. This issue affects some unknown processing of the file /v1/files of the component File Upload. Performing a manipulation results in path traversal. This vulnerability is known as CVE-2026-51882. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in chatchat-space Langchain-Chatchat 0.3.0. It has been classified as critical. This affects some unknown processing of the file /v1/files of the component File Upload. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The OpenAI-compatible file upload endpoint `/v1/files` in Langchain-Chatchat 0.3.0 is vulnerable to path traversal. An attacker can write files to arbitrary locations outside the `openai_files` directory by crafting malicious filenames.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-51882 since 06/08/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/02/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

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

Website

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

CPE 2.3info

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CPE 2.2info

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