A buffer overflow issue was addressed with improved memory handling. This issue is fixed in macOS Monterey 12.3, Safari 15.4, watchOS 8.5, iTunes 12.12.3 for Windows, iOS 15.4 and iPadOS 15.4, tvOS 15.4. Processing maliciously crafted web content 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/HT213187
https://support.apple.com/en-us/HT213186