A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Monterey 12.3, Safari 15.4, watchOS 8.5, iOS 15.4 and iPadOS 15.4, tvOS 15.4. Processing maliciously crafted web content may lead to code execution.
https://support.apple.com/en-us/HT213193
https://support.apple.com/en-us/HT213187
https://support.apple.com/en-us/HT213186