An issue was discovered in certain Apple products. iOS before 11.4 is affected. iOS before 11.3.1 is affected. Safari before 11.1 is affected. iCloud before 7.5 on Windows is affected. iTunes before 12.7.5 on Windows is affected. tvOS before 11.4 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.
https://support.apple.com/HT208853
https://support.apple.com/HT208852
https://support.apple.com/HT208850
https://support.apple.com/HT208848
https://support.apple.com/HT208743
https://support.apple.com/HT208741
https://security.gentoo.org/glsa/201808-04