EUVD-2026-42873

Plug.Parsers.MULTIPART, the multipart request-body parser used to handle file uploads and multipart forms, does not enforce its :length budget against all consumed resources, allowing an unauthenticated remote attacker to cause denial of service. The parser charges the :length limit only for part...

Denial of service due to unlimited number of parts

Impact The multipart body parser accepts an unlimited number of file parts. The multipart body parser accepts an unlimited number of field parts. The multipart body parser accepts an unlimited number of empty parts as field parts. Patches This is fixed in v7.4.1 for Fastify v4.x and v6.0.1 for...