Apple released a massive security update today, the update is around 50mb. The update fixes many vulnerabilities on macs. The most serious vulnerability could lead to someone getting remote access to your computer. Apple seems to be on top of their game update wise, keeping my mac safe :D.
There is no trend or theme here. The most serious vulnerabilities could lead to someone gaining remote access to a user’s computer, while others may simply cause an application or service to crash. Other components mentioned in this update include AppKit, Core Foundation, Core Services, curl, CUPs, Help Viewer, ImageRaw, mDNSResponder, Podcast Producer, Preview, Printing and System Configuration