libdns in ISC BIND 9.10.0 before P2 does not properly handle EDNS options, which allows remote attackers to cause a denial of service (REQUIRE assertion failure and daemon exit) via a crafted packet, as demonstrated by an attack against named, dig, or delv.
https://kb.isc.org/article/AA-01171/
https://kb.isc.org/article/AA-01166/
http://www.securitytracker.com/id/1030414