{"schema_version":"1.7.5","id":"GO-2026-4971","published":"2026-05-07T19:21:40Z","modified":"2026-08-26T10:42:13.474920113Z","aliases":["BIT-golang-2026-39836","CVE-2026-39836"],"related":["CGA-g4vf-wmcj-mwwf","RHSA-2026:22112","RHSA-2026:22120","RHSA-2026:22121","RHSA-2026:23262","RHSA-2026:23264"],"summary":"Panic in Dial and LookupPort when handling NUL byte on Windows in net","details":"The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).","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":["Dial","DialTimeout","Dialer.Dial","Dialer.DialContext","Listen","ListenConfig.Listen","ListenConfig.ListenPacket","ListenPacket","LookupAddr","LookupCNAME","LookupHost","LookupIP","LookupMX","LookupNS","LookupPort","LookupSRV","LookupTXT","ResolveIPAddr","ResolveTCPAddr","ResolveUDPAddr","Resolver.LookupAddr","Resolver.LookupCNAME","Resolver.LookupHost","Resolver.LookupIP","Resolver.LookupIPAddr","Resolver.LookupMX","Resolver.LookupNS","Resolver.LookupNetIP","Resolver.LookupPort","Resolver.LookupSRV","Resolver.LookupTXT","Resolver.lookupAddr","Resolver.lookupMX","Resolver.lookupNS","Resolver.lookupPort","Resolver.lookupSRV","Resolver.lookupTXT"]}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-4971.json"}}],"references":[{"type":"REPORT","url":"https://go.dev/issue/79006"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M"},{"type":"FIX","url":"https://go.dev/cl/775320"}],"database_specific":{"review_status":"REVIEWED","url":"https://pkg.go.dev/vuln/GO-2026-4971"}}