The Java for Mac OS X 10.5 Update 5 includes patches for security holes covered by Sun Microsystems last month. The vulnerabilities exist in Java 1.6.0_13, the most serious of which may allow an untrusted Java applet to obtain elevated privileges. Visiting a web page containing a maliciously crafted untrtrusted Java. applet may lead to arbitrary code execution with the privileges of the current user, Apple says. The update is available via the Software Update pane in System Preferences or Apple s Software Downloads.
Source: https://threatpost.com/apple-patches-15-java-mac-security-flaws-090409/72237/