Multiple memory corruption issues were addressed with improved memory handling. This issue affected versions prior to iOS 12.1, tvOS 12.1, watchOS 5.1, Safari 12.0.1, iTunes 12.9.1, iCloud for Windows 7.8.
https://support.apple.com/kb/HT209198
https://support.apple.com/kb/HT209197
https://support.apple.com/kb/HT209196
https://support.apple.com/kb/HT209195
https://support.apple.com/kb/HT209194
https://support.apple.com/kb/HT209192
http://packetstormsecurity.com/files/155871/Sony-Playstation-4-Webkit-Code-Execution.html