UPDATE: Apple has posted a new version of this update fixing a bug with Safari which caused unexpected quits.
Apple has posted a Security Update numbered "2007-009" (v 1.0) for Mac OS X Tiger 10.4 and Leopard 10.5 operating systems.
Security Update 2007-009 is recommended for all users and improves the security of the following components:
Core Foundation
CUPS
Flash Player Plug-in
Launch Services
perl
python
Quick Look
ruby
Safari
Samba
Shockwave Plug-in
Spin Tracer
For detailed information on this update, please visit this website: http://docs.info.apple.com/article.html?artnum=61798 [1].
The update weights 35.4MB and is available for download either from the Software Update utility or through Apple's support web site [2]