Unspecified vulnerability in International Components for Unicode (ICU) before 53.1.0, as used in Apple OS X before 10.11 and watchOS before 2, has unknown impact and attack vectors.
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://support.apple.com/HT205267
https://support.apple.com/HT205213
http://www.securitytracker.com/id/1033703
http://www.securityfocus.com/bid/76911
http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
http://lists.apple.com/archives/security-announce/2015/Sep/msg00005.html