An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.6.1 and iPadOS 15.6.1, macOS Monterey 12.5.1, Safari 15.6.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
https://www.tenable.com/cyber-exposure/tenable-2022-threat-landscape-report
https://support.apple.com/en-us/HT213486
https://support.apple.com/en-us/103007
https://support.apple.com/en-us/103006
https://support.apple.com/en-us/103005
https://www.debian.org/security/2022/dsa-5220
https://www.debian.org/security/2022/dsa-5219
https://support.apple.com/en-us/HT213414
https://support.apple.com/en-us/HT213413
https://support.apple.com/en-us/HT213412
https://security.gentoo.org/glsa/202208-39
https://lists.debian.org/debian-lts-announce/2022/08/msg00019.html
http://www.openwall.com/lists/oss-security/2022/09/13/1
http://www.openwall.com/lists/oss-security/2022/09/02/10
http://www.openwall.com/lists/oss-security/2022/08/29/2
http://www.openwall.com/lists/oss-security/2022/08/29/1
http://www.openwall.com/lists/oss-security/2022/08/26/2
http://www.openwall.com/lists/oss-security/2022/08/25/5