The set_ipv6() function in zscan_rfc1035.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/cve-osv-conversion/alpine/ALPINE-CVE-2019-13952.json"