Remote Apple Events in Apple Mac OS X 10.4.11 and 10.5.6 allows remote attackers to cause a denial of service (application termination) or obtain sensitive information via unspecified vectors that trigger an out-of-bounds memory access.
http://www.vupen.com/english/advisories/2009/0422
http://www.securityfocus.com/bid/33814
http://www.securityfocus.com/bid/33759
http://support.apple.com/kb/HT3438
http://lists.apple.com/archives/security-announce/2009/Feb/msg00000.html