named in ISC BIND 9.x before 9.9.9-P4 9.10.x before 9.10.4-P4 and 9.11.x before 9.11.0-P1 allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a DNAME record in the answer section of a response to a recursive query related to db.c and resolver.c.