The issue was addressed with improved memory handling. This issue is fixed in visionOS 26, Safari 26, iOS 26 and iPadOS 26, watchOS 26. Processing maliciously crafted web content may lead to an unexpected Safari crash.
https://thehackernews.com/2025/09/apple-backports-fix-for-cve-2025-43300.html
https://support.apple.com/en-us/125116
https://support.apple.com/en-us/125115
https://support.apple.com/en-us/125113
https://support.apple.com/en-us/125108
http://www.openwall.com/lists/oss-security/2025/09/22/3
http://seclists.org/fulldisclosure/2025/Sep/59