[Dermot]

This update was to patch a flaw found in the audio conferencing Active X

Yahoo! recently identified a security issue, commonly referred to as a buffer overflow in an ActiveX control. This control is part of the Yahoo! Messenger audio conferencing code.

Some impacts of a buffer overflow might include being involuntarily logged out of a Chat and/or Instant Messaging session, the crash of an application such as Internet Explorer, and in some instances, the introduction of executable code. For this specific security issue, these impacts could only be possible if an attacker is successful in prompting someone to view malicious HTML code, most likely executed by getting a person to visit their web page

Full explanation below..

Security Update - Yahoo! Messenger