An issue was discovered in certain Apple products. iOS before 10.2 is affected. macOS before 10.12.2 is affected. watchOS before 3.1.3 is affected. The issue involves the "ImageIO" component. It allows remote attackers to obtain sensitive information from process memory or cause a denial of service (out-of-bounds read and application crash) via a crafted web site.
https://support.apple.com/HT207487
https://support.apple.com/HT207423
https://support.apple.com/HT207422