NPM: fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers

NPM: fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers vulnerability discovered by ? in WordPress Npm fastify versions = 4.0.0, 5.12.2...

fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers

Impact Fastify routes a malformed URL under one plugin prefix to the custom not-found handler of a different sibling plugin, invoking the handler registered last and skipping the preHandler declared in its setNotFoundHandler. When the request method has no route in the main router, a malformed...