On 10 September 2009, Apple released Mac OS X 10.6.1 Update to improve system performance and compatiblities and address security vulnerabilities in the Adobe Flash Player plug-in, the most serious of which may lead to arbitrary code execution when viewing a maliciously crafted web site.
Mac OS X 10.6.1 Update is recommended for all users running Mac OS X Snow Leopard.
For more info, see About the security content of the Mac OS X v10.6.1 Update.
Mac OS X 10.6.1 Update may be obtained from the Software Update preferences or from Apple Downloads website.
For a listing of all security updates, see the Apple Security Updates website.