Net/DNS/RR/A.pm in Net::DNS 0.60 build 654, as used in packages such as SpamAssassin and OTRS, allows remote attackers to cause a denial of service (program "croak") via a crafted DNS response.
http://www.securitytracker.com/id?1019104
http://www.mandriva.com/security/advisories?name=MDVSA-2008:073
http://www.debian.org/security/2008/dsa-1515
http://secunia.com/advisories/29555
http://secunia.com/advisories/29446
http://secunia.com/advisories/29354