CVE-2016-5426
PowerDNS (aka pdns) Authoritative Server before 3.4.10 allows remote attackers to cause a denial of service (backend CPU consumption) via a long qname.
Date published : 2016-09-21
http://www.securityfocus.com/bid/92917
https://doc.powerdns.com/md/security/powerdns-advisory-2016-01/