{"schema_version":"1.7.5","id":"GO-2026-4981","published":"2026-05-07T19:21:40Z","modified":"2026-09-10T10:41:34.619418376Z","aliases":["BIT-golang-2026-33811","CVE-2026-33811"],"related":["RHSA-2026:22112","RHSA-2026:22120","RHSA-2026:22121","RHSA-2026:23262","RHSA-2026:23264","RHSA-2026:34357","RHSA-2026:34359","RHSA-2026:35832","RHSA-2026:36617","RHSA-2026:36776","RHSA-2026:36796","RHSA-2026:38504","RHSA-2026:39266","RHSA-2026:39272","RHSA-2026:39319","RHSA-2026:39573","RHSA-2026:39810","RHSA-2026:41019","RHSA-2026:42078","RHSA-2026:42079","RHSA-2026:42082","RHSA-2026:42150","RHSA-2026:42151","RHSA-2026:42240","RHSA-2026:42946","RHSA-2026:49702","RHSA-2026:49703","RHSA-2026:49712","RHSA-2026:50319","RHSA-2026:50336","RHSA-2026:51187","RHSA-2026:53412","RHSA-2026:53413","RHSA-2026:53415","RHSA-2026:54168","RHSA-2026:54191","RHSA-2026:54552","RHSA-2026:54757","RHSA-2026:56785","RHSA-2026:56852","RHSA-2026:56910","RHSA-2026:57482","RHSA-2026:57649","RHSA-2026:60018","RHSA-2026:61253","RHSA-2026:61313","RHSA-2026:65534","RHSA-2026:65886"],"summary":"Crash when handling long CNAME response in net","details":"When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.","affected":[{"package":{"name":"stdlib","ecosystem":"Go","purl":"pkg:golang/stdlib"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.25.10"},{"introduced":"1.26.0-0"},{"fixed":"1.26.3"}]}],"ecosystem_specific":{"imports":[{"path":"net","symbols":["LookupCNAME","Resolver.LookupCNAME","cgoResSearch"]}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-4981.json"}}],"references":[{"type":"REPORT","url":"https://go.dev/issue/78803"},{"type":"FIX","url":"https://go.dev/cl/767860"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M"}],"database_specific":{"review_status":"REVIEWED","url":"https://pkg.go.dev/vuln/GO-2026-4981"},"credits":[{"name":"hamayanhamayan"}]}