"Java for Mac OS X 10.6 Update 2
Java for Mac OS X 10.6 Update 2 delivers improved compatibility, security, and reliability by updating Java SE 6 to 1.6.0_20.

Please quit any web browsers and Java applications before installing this update.
For more details on this update, please visit this website: http://support.apple.com/kb/HT4141
For information on the security content of this update, please visit this website: http://support.apple.com/kb/HT1222
System Requirements: Mac OS X 10.6.3"

Apple's HT1222 (security updates doc) hadn't been updated yet when I posted this but here's the specific doc About the security content of Java for Mac OS X 10.6 Update 2.

"Java for Mac OS X 10.5 Update 7
Java for Mac OS X 10.5 Update 7 delivers improved compatibility, security, and reliability by updating J2SE 5.0 to 1.5.0_24, and updating Java SE 6 to 1.6.0_20 for 64-bit capable Intel-based Macs. J2SE 1.4.2 is no longer being updated to fix bugs or security issues and remains disabled by default in this update.

Please quit any web browsers and Java applications before installing this update.
For more details on this update, please visit this website: http://support.apple.com/kb/HT4140
For information on the security content of this update, please visit this website: http://support.apple.com/kb/HT1222
System Requirements: Mac OS X 10.5.8"

Here's the specific doc About the security content of Java for Mac OS X 10.5 Update 7.

• 2010 MacBook Pro 15in (core i5) review (reghardware uk)
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• About the Java for Mac OS X 10.6 Update 2
• About the Java for Mac OS X 10.5 Update 7
• About the security content of Java for Mac OS X 10.5 Update 7
• About the security content of Java for Mac OS X 10.6 Update 2
• iPad: About File Sharing
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• About integrated video on Intel-based Macs
• Monitor and Display Adapter Table
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