{"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": "2026-05-07T19:41:19.854Z"}, "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"}]}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations."}], "id": "CVE-2026-39820", "lastModified": "2026-05-07T20:38:04.860", "metrics": {}, "published": "2026-05-07T20:16:43.187", "references": [{"source": "security@golang.org", "url": "https://go.dev/cl/759940"}, {"source": "security@golang.org", "url": "https://go.dev/issue/78566"}, {"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-2026-4986"}], "sourceIdentifier": "security@golang.org", "vulnStatus": "Awaiting Analysis"}

{}