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Description

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.

PUBLISHED Reserved 2026-06-29 | Published 2026-06-30 | Updated 2026-07-14 | Assigner VulnCheck




CRITICAL: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

HIGH: 8.8CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Product status

Default status
affected

Any version
affected

4fd4da603801766b14ad8788649cfc1ad21f99a6 (git)
unaffected

Credits

George Chen finder

References

github.com/OpenBMB/ChatDev/issues/638 (Researcher Disclosure) technical-description exploit

github.com/OpenBMB/ChatDev/pull/641 (Fix PR) issue-tracking

github.com/...ommit/4fd4da603801766b14ad8788649cfc1ad21f99a6 (Fix Commit) patch

www.vulncheck.com/...-allows-arbitrary-file-write-and-delete third-party-advisory

cve.org (CVE-2026-58166)

nvd.nist.gov (CVE-2026-58166)

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