Use-after-free vulnerability in Microsoft Word in Office 2000 and XP SP3, 2003 SP2 and SP3, and 2007 Office System SP1 and earlier allows remote attackers to execute arbitrary code via an HTML document with a large number of Cascading Style Sheets (CSS) selectors, related to a "memory handling error" that triggers memory corruption.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5012
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2008/ms08-026
http://www.vupen.com/english/advisories/2008/1504/references
http://www.us-cert.gov/cas/techalerts/TA08-134A.html
http://www.securitytracker.com/id?1020014
http://www.securityfocus.com/bid/29105
http://secunia.com/advisories/30143
http://marc.info/?l=bugtraq&m=121129490723574&w=2
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=700