Versions mentioned in the description apply to the upstream
Remediation section below for
Debian:10 relevant versions.
validator/val_nsec3.c in Unbound before 1.4.13p2 does not properly perform proof processing for NSEC3-signed zones, which allows remote DNS servers to cause a denial of service (daemon crash) via a malformed response that lacks expected NSEC3 records, a different vulnerability than CVE-2011-4528.
unbound to version 1.4.14-1 or higher.