To fix the zero-day vulnerability Apple has released Safari 15.6.1 for macOS Big Sur and Catalina.

Zero-Day Patched Today is an out-of-bound writing issue in webkit 

An out-of-bound write vulnerability occurs when an attacker can supply input to a program that causes it to write data before or before the end of the memory buffer

This causes the program to crash, corrupt the data, or in the worst case lead to the execution of remote code.

Apple says they fixed the bug through better border checks

Apple said the vulnerability was revealed by a researcher who wants to remain anonymous

This zero-day vulnerability is the same as what Apple did yesterday for macOS Monterey and iPhone/iPhone. Patch was done for iPads

Apple released macOS Monterey 12.5.1, iOS 15.6.1, and iPadOS 15.6.1 yesterday, including improvements for both webkit and kernel vulnerabilities.

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