CVE-2026-77078: multer vulnerable to Denial of Service via crafted multipart field names

A vulnerability in multer allows a remote, unauthenticated attacker to crash the Node.js process with a single multipart/form-data request. Two specially crafted text field names cause an uncaught RangeError: Invalid array length inside multer’s field parsing, which is not routed to the application error handler and terminates the process. All applications using multer to parse multipart requests are affected.