A flaw was found in WebKitGTK. An out-of-bounds read was addressed with improved bounds checking.
Reference: https://webkitgtk.org/security/WSA-2022-0001.html
This issue was addressed with improved checks. This issue is fixed in macOS Monterey 12.1, Security Update 2021-008 Catalina, macOS Big Sur 11.6.2. A local user may be able to cause unexpected system termination or read kernel memory.