The issue was addressed with improved memory handling. This issue is fixed in visionOS 2.2, tvOS 18.2, Safari 18.2, watchOS 11.2, iOS 18.2 and iPadOS 18.2, macOS Sequoia 15.2. Processing maliciously crafted web content may lead to memory corruption.
https://support.apple.com/en-us/121846
https://support.apple.com/en-us/121845
https://support.apple.com/en-us/121844
https://support.apple.com/en-us/121843