The issue was addressed with improved memory handling. This issue is fixed in visionOS 2.4, tvOS 18.4, iPadOS 17.7.6, iOS 18.4 and iPadOS 18.4, macOS Sequoia 15.4, Safari 18.4. Processing maliciously crafted web content may lead to an unexpected Safari crash.
https://support.apple.com/en-us/122379
https://support.apple.com/en-us/122378
https://support.apple.com/en-us/122377
https://support.apple.com/en-us/122373