Apple has released a new macOS Mojave Supplemental Update, which includes the security content of Safari 14. It replaces macOS Mojave Security Update 2020-005, pulled this week because of glitches with system sluggishness, slow boot times, high fan speeds, memory problems, and more.
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macOS Mojave Supplemental Update purportedly fixes all issues caused by Mojave 2020-005 Security Update, as well as bugs related to Safari 14. The update can be downloaded and installed through the Software Update menu in the macOS System Preferences app.