Buffer underflow in QuickTime in Apple Mac OS X before 10.7.4 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted MPEG file.
http://www.securityfocus.com/bid/53469
http://www.securityfocus.com/bid/53445
http://support.apple.com/kb/HT5281
http://support.apple.com/kb/HT5261
http://lists.apple.com/archives/security-announce/2012/May/msg00005.html
http://lists.apple.com/archives/security-announce/2012/May/msg00001.html