Multiple vulnerabilities have been reported in Apple Mac OS X and applications. Proof of Concept code has already been posted along with the information regarding the vulnerabilities. At this time no patches or workarounds appear to be available for the majority of the vulnerabilities. The impact is Denial of Service or arbitrary code executed remotely, and severity is highly critical.
http://isc.sans.org/diary.php?storyid=1282
http://isc.sans.org/diary.php?storyid=1282