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