updated 01:46 pm EST, Tue February 25, 2014
SSL fix present but undocumented
(Updated with Safari, security updates for Lion, Mountain Lion) Following a long beta-testing period, Apple has released the finished v10.9.2 update for owners of OS X Mavericks. The software primarily adds support for FaceTime audio calls in both the FaceTime app and Messages. The two apps have also gained contact blocking, allowing people to screen out individual users.
Though not mentioned in Apple's main release notes, the update also delivers a promised fix to an SSL vulnerabilty that was originally discovered in iOS. Mail fixes deal with inaccurate unread message counts, and email failing to download from some providers. AutoFill has been improved in Safari, and both Mail and Finder should have better VoiceOver navigation. Other solved glitches include audio distortions, VPN disconnections, and trouble connecting to file servers using SMB2.
Mac owners can download v10.9.2 via the Mac App Store's Software Update tab.
Update: Apple has also released matching Security Updates, both labeled 2014-001, for Lion and Mountain Lion.
Update 2: Apple has further released Safari 6.1.2 and 7.0.2, the latter of which is included in v10.9.2. Although full release notes aren't available, both updates fix a WebKit vulnerability that could be used to cause crashes or hijack a system. 6.1.2 can be downloaded via the Mac App Store in Mountain Lion, or Software Update in Lion.