This update improves security. It includes fixes for vulnerabilities that an attacker can use to overwrite the contents of your computer's memory with malicious code.
Operating systems Mac OS X 10.3, Mac OS X 10.4 PPC, Mac OS X 10.3.9, Mac OS X 10.7, Mac OS X 10.4, Mac OS X 10.5 PPC, Mac OS X 10.6, Mac OS X 10.5, Mac OS X 10.2