Apple has released a security update for Leopard. Apart from this update, Apple has also released a Flashback removal tool for that version of the OS.
Apple has released three Extensible Firmware Interface (EFI) firmware updates that bring Lion’s Internet Recovery feature to the Mid-2010 iMac, Early 2010 MacBook Pro, and Late 2010 MacBook Air.
Last week, along with the OS X 10.7.3 update (which later turned out to be having bug), Apple had released Security Update 2012-001 for those Mac users who are skeptical about Lion and prefer OS X 10.6 Snow Leopard over Lion.
On 8 November 2011, Apple released a pair of Java 6 updates for Lion and Snow Leopard.