Adobe Flash contributes largest number of security patches in Apple's Mac OS X 10.6.5
Apple has detailed the security issues patched by Mac OS X 10.6.5 and the corresponding Security Update 2010-007 for Mac OS X 10.5, indicating that more than half of the security vulnerabilities in Mac OS X actually affect the Adobe Flash plugin and X11.
http://feeds.appleinsider.com/click.phdo?i=60acc9ffae4d8b7f3acd52ce3553de41