CVE-2026-85684: marker through 2.0.0 Path Traversal via upload filename
marker through 2.0.0 contains a path traversal vulnerability in the FastAPI /marker/upload handler that fails to sanitize the file.filename parameter. Unauthenticated attackers can supply filenames containing directory traversal sequences to write arbitrary files to any location or delete existing files on the system.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
Any unauthenticated remote attacker who can reach the FastAPI /marker/upload endpoint can attempt exploitation. No privileges or user interaction are required.
What input is used to trigger the traversal?
The vulnerable handler uses the uploaded file's file.filename value without sanitizing it. An attacker can provide a filename containing directory-traversal sequences to target filesystem paths outside the intended upload location.
What could successful exploitation allow?
Successful exploitation can allow arbitrary file writes to locations on the system and deletion of existing files. The reported impact affects integrity and availability.
Which versions are identified as affected?
Marker through version 2.0.0 is identified as affected. The provided data does not identify a fixed version or workaround.