libxml2 in Apple iOS before 8.4.1 and OS X before 10.10.5 allows remote attackers to obtain sensitive information from process memory or cause a denial of service (memory corruption) via a crafted XML document.
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
http://lists.apple.com/archives/security-announce/2015/Aug/msg00002.html
http://lists.apple.com/archives/security-announce/2015/Dec/msg00000.html
http://lists.apple.com/archives/security-announce/2015/Dec/msg00001.html
http://lists.apple.com/archives/security-announce/2015/Dec/msg00005.html
http://www.securityfocus.com/bid/76343
http://www.securitytracker.com/id/1033275
https://support.apple.com/HT205635
https://support.apple.com/HT205637
https://support.apple.com/HT205640