Apple tonight pushed Security Update 2010-001 to users of Mac OS 10.5.8 and 10.6.2 via Software Update.
The 22.4MB update is recommended for all users and "improves the security of Mac OS X." It fixes six vulnerabilities in Mac OS X, including flaws in:
- Flash Player plug-in
- Image RAW
Read more about the specific vulnerabilities in Apple knowledgebase article: HT4004.