The security holes could have let attackers take control of users' desktops, but the update to OS X 10.10.2 patches them, according to Apple's notes.
These flaws also included Thunderstrike, a vulnerability that was exposed earlier in January.
This isn't purely a security update, though. The newest version of Yosemite also fixes bugs with Safari pages, VoiceOver, audio and video syncing with Bluetooth devices, and even the persistent Wi-Fi issues you may have heard about.
Oh, and it finally lets you browse through iCloud in Time Machine. OS X 10.10.2 is available now for all Mac users.
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Via Mac Rumors