An out-of-bounds read was addressed with improved input validation. This issue is fixed in Safari 18.6, watchOS 11.6, visionOS 2.6, iOS 18.6 and iPadOS 18.6, macOS Sequoia 15.6, tvOS 18.6. Processing maliciously crafted web content may disclose internal states of the app.
https://support.apple.com/en-us/124155
https://support.apple.com/en-us/124154
https://support.apple.com/en-us/124153
https://support.apple.com/en-us/124152