{"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":"2026-05-08T14:25:43.896Z"},"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"}]},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-05-08T14:25:39.702568Z","id":"CVE-2026-33811","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-08T14:25:43.896Z"}}]}}