QuickLook in Apple Mac OS X 10.6.x before 10.6.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted Excel file.
http://www.vupen.com/english/advisories/2010/3046
http://www.securitytracker.com/id?1024723
http://support.apple.com/kb/HT5004
http://support.apple.com/kb/HT4456
http://support.apple.com/kb/HT4435
http://secunia.com/advisories/42314
http://lists.apple.com/archives/security-announce/2010//Nov/msg00003.html
http://lists.apple.com/archives/security-announce/2010//Nov/msg00000.html
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00006.html
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=881