libxml2 in Apple iOS before 9.3.3, OS X before 10.11.6, iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on Windows, tvOS before 9.2.2, and watchOS before 2.2.2 allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via unknown vectors, a different vulnerability than CVE-2016-4614, CVE-2016-4616, and CVE-2016-4619.
https://support.apple.com/HT206905
https://support.apple.com/HT206904
https://support.apple.com/HT206903
https://support.apple.com/HT206902
https://support.apple.com/HT206901
https://support.apple.com/HT206899
http://www.securitytracker.com/id/1036348
http://www.securityfocus.com/bid/91826
http://lists.apple.com/archives/security-announce/2016/Jul/msg00005.html
http://lists.apple.com/archives/security-announce/2016/Jul/msg00003.html
http://lists.apple.com/archives/security-announce/2016/Jul/msg00002.html
http://lists.apple.com/archives/security-announce/2016/Jul/msg00001.html
http://lists.apple.com/archives/security-announce/2016/Jul/msg00000.html