Versions mentioned in the description apply to the upstream
Remediation section below for
Debian:10 relevant versions.
A flaw was found in the way unbound before 1.6.8 validated wildcard-synthesized NSEC records. An improperly validated wildcard NSEC record could be used to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick unbound into accepting a NODATA proof.
unbound to version 1.7.1-1 or higher.