Buffer overflow in the YMMAPI.YMailAttach ActiveX control (ymmapi.dll) before 2005.1.1.4 in Yahoo! Messenger allows remote attackers to execute arbitrary code via a crafted HTML document. NOTE: some details were obtained from third party information.
http://www.vupen.com/english/advisories/2006/5016
http://www.securityfocus.com/bid/21607
http://www.kb.cert.org/vuls/id/901852
http://securitytracker.com/id?1017387