Buffer overflow in the header_get_field_name function in header.c for GNU Mailutils 0.5 and 0.6, and other versions before 0.6.90, allows remote attackers to execute arbitrary code via a crafted e-mail.
http://www.securityfocus.com/bid/13766
http://www.idefense.com/application/poi/display?id=249&type=vulnerabilities
http://www.debian.org/security/2005/dsa-732