OpenBMB ChatDev up to 2.2.0 File Upload Endpoint path traversal

Summaryinfo

A vulnerability classified as critical has been found in OpenBMB ChatDev up to 2.2.0. This affects an unknown function of the component File Upload Endpoint. Performing a manipulation results in path traversal. This vulnerability is reported as CVE-2026-58166. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in OpenBMB ChatDev up to 2.2.0. This affects some unknown processing of the component File Upload Endpoint. 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 integrity, and availability. The summary by CVE is:

OpenBMB ChatDev through 2.2.0, fixed in commit 4fd4da6, contains a path traversal vulnerability that allows unauthenticated remote attackers to write or delete arbitrary files by supplying a malicious multipart filename in the file upload endpoint. Attackers can send a crafted filename containing path traversal sequences or an absolute path to the POST uploads session endpoint, which constructs the destination path without sanitization in save_upload_file, causing file write and cleanup operations to target attacker-chosen paths on the server filesystem.

The weakness was disclosed by George Chen as 638. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-58166 since 06/29/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading eliminates this vulnerability. Applying the patch 4fd4da603801766b14ad8788649cfc1ad21f99a6 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Chat Software

Vendor

• OpenBMB

Name

• ChatDev

Version

• 2.0
• 2.1
• 2.2.0

License

• open-source

Website

• Product: https://github.com/OpenBMB/ChatDev/

CPE 2.3info

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CPE 2.2info

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