Apple released a new version of Safari 14.1 for macOS Catalina and macOS Mojave users, introducing two WebKit bug fixes that were fixed in macOS Big Sur yesterday.
The Safari version support document shows that this update also solves the memory corruption problem in WebKit and the integer overflow problem for users of older versions of macOS.
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Apple pointed out that there are reports that these problems may have been exploited, and users are advised to upgrade immediately.
Apple also stated that the new Safari 14.1 version includes the security content of the 14.1 updates released on April 26, 2021. Its internal version number in macOS Catalina is 15611.1.21.161.7, which is inside macOS Mojave The version number is 14611.1.21.161.7.
(Via)
