Dnsmasq 2.86 has a heap-based buffer overflow in answer_request (called from FuzzAnswerTheRequest and fuzz_rfc1035.c). NOTE: the vendor's position is that CVE-2021-45951 through CVE-2021-45957 "do not represent real vulnerabilities, to the best of our knowledge.
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-935.yaml