Stack-based buffer overflow in the Java Web Start command launcher in Java for Mac OS X 10.5 before Update 5 allows attackers to execute arbitrary code or cause a denial of service (application crash) via unspecified vectors.
http://www.vupen.com/english/advisories/2009/2543
http://securitytracker.com/id?1022820
http://lists.apple.com/archives/security-announce/2009/Sep/msg00000.html