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Apple appears to have pulled the latest macOS Mojave Security Update, as well as the Safari 14 download for macOS Mojave, after users ran into a slew of problems.
According to Mr. Macintosh, some of the issues that users experienced include problems with memory, slow boot and high fan speeds, system sluggishness, and stalls in Finder, among other problems. Apple pulled both updates at around 5 p.m. Eastern on Sept. 30.
Complaints about the update started to surface shortly after it was released on Sept. 24, though the Safari 14 update for Mojave was released on Sept. 16. The exact update for macOS Mojave was Security Update 2020-005, and it addressed a number of security vulnerabilities in Mail, ImageIO, and the Sandbox.
Users who are still running the updates on macOS Mojave machines should expect some type of patch or fix soon. Reports suggest that reinstalling the operating system, reverting to a prior Time Machine backup, or updating to macOS Catalina could also mitigate the issues.
No problems were reported for the Sept. 24 macOS Catalina Security Update or the Safari 14 update for that operating system.