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-2016-4615 and CVE-2016-4619.