A type confusion issue was addressed with improved checks. This issue is fixed in iOS 17.3 and iPadOS 17.3, macOS Sonoma 14.3, tvOS 17.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been exploited.
https://support.apple.com/kb/HT214063
https://support.apple.com/kb/HT214061
https://support.apple.com/kb/HT214059
https://support.apple.com/kb/HT214058
https://support.apple.com/kb/HT214057
https://support.apple.com/kb/HT214056
https://support.apple.com/kb/HT214055
https://support.apple.com/en-us/HT214061