When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.CreditshamayanhamayanReferenceshttps://go.dev/issue/78803https://go.dev/cl/767860https://groups.google.com/g/golang-announce/c/qcCIEXso47Mhttps://pkg.go.dev/vuln/GO-2026-4981
