An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in Safari 16, iOS 16, iOS 15.7 and iPadOS 15.7. Processing maliciously crafted web content may lead to arbitrary code execution.
https://support.apple.com/en-us/HT213442
https://support.apple.com/en-us/HT213445
https://support.apple.com/en-us/HT213446
http://seclists.org/fulldisclosure/2022/Oct/28
http://seclists.org/fulldisclosure/2022/Oct/41
http://seclists.org/fulldisclosure/2022/Oct/47
http://seclists.org/fulldisclosure/2022/Oct/49
http://seclists.org/fulldisclosure/2022/Oct/39