A vulnerability was found in the implementation of DNSSEC in Dnsmasq up to and including 2.78. Wildcard synthesized NSEC records could be improperly interpreted to prove the non-existence of hostnames that actually exist.
http://www.securityfocus.com/bid/102812
http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2018q1/011896.html
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00027.html