Secunia: .png, .jpeg and now .doc !:
HexView has discovered a vulnerability in Microsoft Word, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise a user's system. This can be exploited to crash the process when the user opens a specially crafted document.

Microsoft is concerned that this new report of a vulnerability in Word was not disclosed responsibly, potentially putting computer users at risk.