{"schema_version":"1.3.1","id":"GO-2026-4971","modified":"2026-05-07T19:21:40Z","published":"2026-05-07T19:21:40Z","aliases":["CVE-2026-39836"],"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"},"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"]}]}}],"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":{"url":"https://pkg.go.dev/vuln/GO-2026-4971","review_status":"REVIEWED"}}