The ActiveX Control (yNotifier.dll) in Yahoo! Assistant 3.6 and earlier allows remote attackers to execute arbitrary code via unspecified vectors in the Ynoifier COM object that trigger memory corruption.
https://exchange.xforce.ibmcloud.com/vulnerabilities/42233
http://www.vupen.com/english/advisories/2008/1471/references
http://www.securitytracker.com/id?1020004
http://www.securityfocus.com/bid/29065