The CFNetwork Proxies subsystem in Apple iOS before 9.3.2, OS X before 10.11.5, and tvOS before 9.2.1 mishandles URLs in http and https requests, which allows remote attackers to obtain sensitive information via unspecified vectors.
https://support.apple.com/HT206568
https://support.apple.com/HT206567
https://support.apple.com/HT206564
http://lists.apple.com/archives/security-announce/2016/May/msg00004.html
http://lists.apple.com/archives/security-announce/2016/May/msg00002.html
http://lists.apple.com/archives/security-announce/2016/May/msg00001.html