An out-of-bounds read was addressed with improved input validation. This issue is fixed in tvOS 15.4, iOS 15.4 and iPadOS 15.4, iTunes 12.12.3 for Windows, watchOS 8.5, macOS Monterey 12.3. Processing a maliciously crafted image may lead to arbitrary code execution.
https://support.apple.com/en-us/HT213193
https://support.apple.com/en-us/HT213188
https://support.apple.com/en-us/HT213186