Apple iTunes before 9.1 allows remote attackers to cause a denial of service (infinite loop) via a crafted MP4 podcast file.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7427
http://support.apple.com/kb/HT4105
http://secunia.com/advisories/39135
http://lists.apple.com/archives/security-announce/2010//Mar/msg00003.html