{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33811", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-03-23T20:35:32.814Z", "datePublished": "2026-05-07T19:41:19.285Z", "dateUpdated": "2026-05-07T19:41:19.285Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-05-07T19:41:19.285Z"}, "title": "Crash when handling long CNAME response in net", "descriptions": [{"lang": "en", "value": "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": [{"vendor": "Go standard library", "product": "net", "collectionURL": "https://pkg.go.dev", "packageName": "net", "versions": [{"version": "0", "lessThan": "1.25.10", "status": "affected", "versionType": "semver"}, {"version": "1.26.0-0", "lessThan": "1.26.3", "status": "affected", "versionType": "semver"}], "programRoutines": [{"name": "cgoResSearch"}, {"name": "LookupCNAME"}, {"name": "Resolver.LookupCNAME"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-415: Double Free"}]}], "references": [{"url": "https://go.dev/issue/78803"}, {"url": "https://go.dev/cl/767860"}, {"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"}, {"url": "https://pkg.go.dev/vuln/GO-2026-4981"}], "credits": [{"lang": "en", "value": "hamayanhamayan"}]}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash."}], "id": "CVE-2026-33811", "lastModified": "2026-05-07T20:38:04.860", "metrics": {}, "published": "2026-05-07T20:16:42.770", "references": [{"source": "security@golang.org", "url": "https://go.dev/cl/767860"}, {"source": "security@golang.org", "url": "https://go.dev/issue/78803"}, {"source": "security@golang.org", "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"}, {"source": "security@golang.org", "url": "https://pkg.go.dev/vuln/GO-2026-4981"}], "sourceIdentifier": "security@golang.org", "vulnStatus": "Awaiting Analysis"}

{}

{"created": "2026-05-07T21:30:25.963824+00:00", "updated": "2026-05-07T21:30:25.963834+00:00", "vendors": [], "weaknesses": ["CWE-415"]}