CVE-2026-73034: DB-GPT v0.8.1 Path Traversal Arbitrary File Write via user_id Header

DB-GPT v0.8.1 contains an unauthenticated path traversal vulnerability that allows remote attackers to write arbitrary files to any location on the server by injecting directory traversal sequences into the userid HTTP header of the Python file-upload endpoint. Attackers can send a crafted multipart upload request with a traversal-poisoned userid header to escape the intended upload directory and write attacker-controlled content to locations such as Python startup hooks, cron directories, or agent scripts, resulting in remote code execution.