CRLF injection vulnerability in the management plugin in RabbitMQ 2.1.0 through 3.4.x before 3.4.1 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the download parameter to api/definitions.
https://groups.google.com/forum/#%21topic/rabbitmq-users/-3Z2FyGtXhs
http://www.securityfocus.com/bid/76091
http://www.rabbitmq.com/release-notes/README-3.4.1.txt