CVE-2026-58166 OpenBMB ChatDev - Unauthenticated Path Traversal in Upload Handler Allows Arbitrary File Write and Delete
Unauthenticated attackers can write or delete arbitrary files via path traversal in the upload handler, potentially leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-58166?
CVE-2026-58166 is a high-severity path traversal vulnerability in OpenBMB ChatDev, published on 30 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-58166?
How do I fix CVE-2026-58166?
No fix has been published for CVE-2026-58166 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-58166 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58166 exists.
Sources
Also known as GHSA-hh77-fhmp-pqfv.