A memory corruption issue was addressed with improved input validation. This issue is fixed in iOS 18.1 and iPadOS 18.1, watchOS 11.1, visionOS 2.1, tvOS 18.1, macOS Sequoia 15.1, Safari 18.1. Processing maliciously crafted web content may lead to an unexpected process crash.
https://support.apple.com/en-us/121571
https://support.apple.com/en-us/121569
https://support.apple.com/en-us/121566
https://support.apple.com/en-us/121565