Related to the newest MS Word 0-day
http://blogs.technet.com/msrc/archive/2006/12/10/new-report-of-a-word-zero-day.aspx 

US-CERT Vulnerability Note VU#166700 released today lists the following new technical detail:

"Microsoft Word fails to properly handle malformed data structures allowing memory corruption to occur."
http://www.kb.cert.org/vuls/id/166700 

- Juha-Matti