WebKit, as used in Apple iOS before 9.2.1 and Safari before 9.0.3, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, a different vulnerability than CVE-2016-1723 and CVE-2016-1726.
https://support.apple.com/HT206168
https://support.apple.com/HT205732
https://support.apple.com/HT205730
https://security.gentoo.org/glsa/201706-15
http://www.securitytracker.com/id/1034737
http://www.securityfocus.com/bid/81263
http://www.securityfocus.com/archive/1/537771/100/0/threaded
http://packetstormsecurity.com/files/136227/WebKitGTK-Memory-Corruption-Denial-Of-Service.html
http://lists.apple.com/archives/security-announce/2016/Mar/msg00001.html
http://lists.apple.com/archives/security-announce/2016/Jan/msg00004.html
http://lists.apple.com/archives/security-announce/2016/Jan/msg00002.html