An improperly performed length calculation on a buffer in PlaintextRecordLayer could lead to an infinite loop and denial-of-service based on user input. This issue affected versions of fizz prior to v2019.03.04.00.
https://github.com/facebookincubator/fizz/commit/40bbb161e72fb609608d53b9d64c56bb961a6ee2
http://packetstormsecurity.com/files/172846/Facebook-Fizz-Denial-Of-Service.html
http://packetstormsecurity.com/files/172836/polkit-Authentication-Bypass.html