PowerDNS Authoritative Server 3.3.0 up to 4.1.4 excluding 4.1.5 and 4.0.6, and PowerDNS Recursor 3.2 up to 4.1.4 excluding 4.1.5 and 4.0.9, are vulnerable to a memory leak while parsing malformed records that can lead to remote denial of service.
https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2018-04.html
https://doc.powerdns.com/authoritative/security-advisories/powerdns-advisory-2018-03.html