The setipv6() function in zscanrfc1035.rl in gdnsd before 2.4.3 and 3.x before 3.2.1 has a stack-based buffer overflow via a long and malformed IPv6 address in zone data.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-13952.json"