Apple has released security updates for Java for both Mac OS X 10.6, Snow Leopard, and Mac OS X 10.5, Leopard. The Java for Mac OS X 10.6 Update 2 and Java for Mac OS X 10.5 Update 7 are available from Software Update, as well as from Apple’s Support Downloads page.
The Snow Leopard update patches thirty bugs, all of which could cause the following:
Visiting a web page containing a maliciously crafted untrusted Java applet may lead to an unexpected application termination or arbitrary code execution with the privileges of the current user.
The Leopard version of the update fixes sixty bugs, many of which are the same, which could lead to the same potential problems.
The updates are 78 and 122 MB respectively.