Unspecified vulnerability in Justsystem Ichitaro 2006, 2006 trial version, and Government 2006 allows remote attackers to execute arbitrary code via a modified document, possibly because of a buffer overflow, a different vulnerability than CVE-2006-4326.
https://exchange.xforce.ibmcloud.com/vulnerabilities/29654
http://www.vupen.com/english/advisories/2006/4092
http://www.securityfocus.com/bid/20610
http://www.justsystem.co.jp/info/pd6004.html