A logic issue was addressed with improved checks. This issue is fixed in iOS 18.4 and iPadOS 18.4, macOS Sequoia 15.4, tvOS 18.4, visionOS 2.4, watchOS 11.4. Processing maliciously crafted web content may result in the disclosure of process memory.
https://support.apple.com/en-us/122378
https://support.apple.com/en-us/122377
https://support.apple.com/en-us/122376
https://support.apple.com/en-us/122373
https://support.apple.com/en-us/122371
http://seclists.org/fulldisclosure/2025/Apr/8
http://seclists.org/fulldisclosure/2025/Apr/4
http://seclists.org/fulldisclosure/2025/Apr/13