An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.6 and iPadOS 15.6, macOS Big Sur 11.6.8, watchOS 8.7, tvOS 15.6, macOS Monterey 12.5, Security Update 2022-005 Catalina. Processing maliciously crafted web content may lead to arbitrary code execution.
https://support.apple.com/en-us/HT213346
https://support.apple.com/en-us/HT213345
https://support.apple.com/en-us/HT213344
https://support.apple.com/en-us/HT213343