WebKit, as used in Apple iOS before 9.3.2, Safari before 9.1.1, and tvOS before 9.2.1, 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-2016-1854, CVE-2016-1856, and CVE-2016-1857.
Apple Security Advisory 2016-05-16-5 - Safari 9.1.1 is now available and addresses history deletion, data disclosure, code execution, and various other vulnerabilities.