CVE-2026-58166

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.

Score

CVSS 3.1 9.1 Critical

Status

Deferred - disclosure@vulncheck.com

Published

2026-06-30

Last modified

2026-10-25

Weaknesses

CWE-22

Affected products

• Chatdev (Openbmb)

References

• https://github.com/OpenBMB/ChatDev/issues/638
• https://github.com/OpenBMB/ChatDev/pull/641
• https://github.com/OpenBMB/ChatDev/commit/4fd4da603801766b14ad8788649cfc1ad21f99a6
• https://www.vulncheck.com/advisories/openbmb-chatdev-unauthenticated-path-traversal-in-upload-handler-allows-arbitrary-…