Debian Linux Security Advisory 3306-1 - Toshifumi Sakaguchi discovered that the patch applied to pdns, an authoritative DNS server, fixing CVE-2015-1868, was insufficient in some cases, allowing remote attackers to cause a denial of service (service-affecting CPU spikes and in some cases a crash).
1a215fcb65099e37092b0721efe6f44ea5c98f4af9701285916a1353d36f6778