QuickLook in Apple Mac OS X 10.4.11 and 10.5.4 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted Microsoft Office file, related to insufficient "bounds checking."
https://exchange.xforce.ibmcloud.com/vulnerabilities/44135
http://www.vupen.com/english/advisories/2008/2268
http://www.securitytracker.com/id?1020607
http://www.securityfocus.com/bid/30493
http://www.securityfocus.com/bid/30483
http://secunia.com/advisories/31326
http://lists.apple.com/archives/security-announce//2008/Jul/msg00003.html