Net::DNS before 0.60, a Perl module, allows remote attackers to cause a denial of service (stack consumption) via a malformed compressed DNS packet with self-referencing pointers, which triggers an infinite loop.
http://www.ubuntu.com/usn/usn-483-1
http://www.net-dns.org/docs/Changes.html
http://www.mandriva.com/security/advisories?name=MDKSA-2007:146