Apple has posted a Security Update labeled "2006-008". It provides the following security fixes:

Security Update 2006-008 is recommended for all users and improves the security of the following components:

Quartz Composer
QuickTime for Java

For detailed information on this update, please visit this website: http://docs.info.apple.com/article.html?artnum=61798

The 2.7MB update is available through the Software Update utility for both the PowerPC and Intel architectures.