QuickTime in Apple OS X before 10.11.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted file.
https://www.exploit-db.com/exploits/39839/
https://support.apple.com/HT206567
http://www.securitytracker.com/id/1035895
http://www.securityfocus.com/bid/90696
http://protekresearchlab.com/cosig-2016-19/
http://lists.apple.com/archives/security-announce/2016/May/msg00004.html