{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42504", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-04-28T00:21:12.792Z", "datePublished": "2026-06-02T22:01:37.219Z", "dateUpdated": "2026-06-03T14:06:13.623Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-06-02T22:01:37.219Z"}, "title": "Quadratic complexity in WordDecoder.DecodeHeader in mime", "descriptions": [{"lang": "en", "value": "Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU."}], "affected": [{"vendor": "Go standard library", "product": "mime", "collectionURL": "https://pkg.go.dev", "packageName": "mime", "versions": [{"version": "0", "lessThan": "1.25.11", "status": "affected", "versionType": "semver"}, {"version": "1.26.0-0", "lessThan": "1.26.4", "status": "affected", "versionType": "semver"}], "programRoutines": [{"name": "WordDecoder.DecodeHeader"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity"}]}], "references": [{"url": "https://go.dev/issue/79217"}, {"url": "https://go.dev/cl/774481"}, {"url": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw"}, {"url": "https://pkg.go.dev/vuln/GO-2026-5038"}], "credits": [{"lang": "en", "value": "p4p3r (https://hackerone.com/p4p3r_hak)"}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-407", "lang": "en", "description": "CWE-407 Inefficient Algorithmic Complexity"}]}], "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": "2026-06-03T14:05:39.682615Z", "id": "CVE-2026-42504", "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": "2026-06-03T14:06:13.623Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "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": {"id": "CVE-2026-42504", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-03T14:05:39.682615Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-407", "description": "CWE-407 Inefficient Algorithmic Complexity"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-03T14:05:35.965Z"}}], "cna": {"title": "Quadratic complexity in WordDecoder.DecodeHeader in mime", "credits": [{"lang": "en", "value": "p4p3r (https://hackerone.com/p4p3r_hak)"}], "affected": [{"vendor": "Go standard library", "product": "mime", "versions": [{"status": "affected", "version": "0", "lessThan": "1.25.11", "versionType": "semver"}, {"status": "affected", "version": "1.26.0-0", "lessThan": "1.26.4", "versionType": "semver"}], "packageName": "mime", "collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "programRoutines": [{"name": "WordDecoder.DecodeHeader"}]}], "references": [{"url": "https://go.dev/issue/79217"}, {"url": "https://go.dev/cl/774481"}, {"url": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw"}, {"url": "https://pkg.go.dev/vuln/GO-2026-5038"}], "descriptions": [{"lang": "en", "value": "Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity"}]}], "providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-06-02T22:01:37.219Z"}}}, "cveMetadata": {"cveId": "CVE-2026-42504", "state": "PUBLISHED", "dateUpdated": "2026-06-03T14:06:13.623Z", "dateReserved": "2026-04-28T00:21:12.792Z", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "datePublished": "2026-06-02T22:01:37.219Z", "assignerShortName": "Go"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU."}], "id": "CVE-2026-42504", "lastModified": "2026-06-04T16:15:50.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-06-02T23:16:37.927", "references": [{"source": "security@golang.org", "url": "https://go.dev/cl/774481"}, {"source": "security@golang.org", "url": "https://go.dev/issue/79217"}, {"source": "security@golang.org", "url": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw"}, {"source": "security@golang.org", "url": "https://pkg.go.dev/vuln/GO-2026-5038"}], "sourceIdentifier": "security@golang.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.25.11)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.26.0-0,1.26.4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "mime", "source": "cna", "vendor": "Go standard library"}, "product": "mime", "vendor": "golang"}], "created": "2026-06-03T04:15:24.752932+00:00", "updated": "2026-06-03T15:30:26.542171+00:00", "vendors": ["golang", "golang$PRODUCT$mime"], "weaknesses": ["CWE-407", "CWE-442"]}