It’s important to note that the bug, which could allow hackers to gain remote control of machines, affects a number of devices including PCs. The Verge notes that, while Microsoft has been automatically updating Windows security vulnerabilities for years, Apple had previously preferred to prompt users to authenticate updates.
Mac users should be notified of the update and after installing, a restart is not required. At this time, no cases are known of Mac computers that have been exploited through this bug.