An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.5 and iPadOS 13.5, macOS Catalina 10.15.5, tvOS 13.4.5, watchOS 6.2.5, iTunes 12.10.7 for Windows, iCloud for Windows 11.2, iCloud for Windows 7.19. Processing a maliciously crafted image may lead to arbitrary code execution.
https://support.apple.com/HT211181
https://support.apple.com/HT211179
https://support.apple.com/HT211178
https://support.apple.com/HT211175
https://support.apple.com/HT211171