{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-39820","assignerOrgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","state":"PUBLISHED","assignerShortName":"Go","dateReserved":"2026-04-07T18:13:03.526Z","datePublished":"2026-05-07T19:41:19.854Z","dateUpdated":"2026-05-08T14:27:54.923Z"},"containers":{"cna":{"providerMetadata":{"orgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","shortName":"Go","dateUpdated":"2026-05-07T19:41:19.854Z"},"title":"Quadratic string concatentation in consumeComment in net/mail","descriptions":[{"lang":"en","value":"Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations."}],"affected":[{"vendor":"Go standard library","product":"net/mail","collectionURL":"https://pkg.go.dev","packageName":"net/mail","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":"addrParser.consumeComment"},{"name":"AddressParser.Parse"},{"name":"AddressParser.ParseList"},{"name":"Header.AddressList"},{"name":"Header.Date"},{"name":"ParseAddress"},{"name":"ParseAddressList"},{"name":"ParseDate"}],"defaultStatus":"unaffected"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-407: Inefficient Algorithmic Complexity"}]}],"references":[{"url":"https://go.dev/issue/78566"},{"url":"https://go.dev/cl/759940"},{"url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M"},{"url":"https://pkg.go.dev/vuln/GO-2026-4986"}],"credits":[{"lang":"en","value":"thatnealpatel"}]},"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":"2026-05-08T14:27:51.595266Z","id":"CVE-2026-39820","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":"2026-05-08T14:27:54.923Z"}}]}}