The WiFi flaw that made headlines a few months ago has finally been fixed
by Apple. While not completely resting on the shoulders of Apple, the flaw affected Mac OS X and the AirPort Extreme Driver, and could result in a system being compromised, or at the very least cause it to crash. Anyone using OS X should already have the update available for install via the automatic update service, or they can manually download it from Apple's site
if they so wish.
Three days ago, Apple also published a fix for a security flaw in QuickTime.