{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42508", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-04-28T00:21:12.792Z", "datePublished": "2026-05-22T02:31:27.644Z", "dateUpdated": "2026-05-22T18:44:33.483Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-05-22T02:31:27.644Z"}, "title": "Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts", "descriptions": [{"lang": "en", "value": "Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked."}], "affected": [{"vendor": "golang.org/x/crypto", "product": "golang.org/x/crypto/ssh/knownhosts", "collectionURL": "https://pkg.go.dev", "packageName": "golang.org/x/crypto/ssh/knownhosts", "versions": [{"version": "0", "lessThan": "0.52.0", "status": "affected", "versionType": "semver"}], "programRoutines": [{"name": "hostKeyDB.IsRevoked"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-295: Improper Certificate Validation"}]}], "references": [{"url": "https://go.dev/issue/79568"}, {"url": "https://go.dev/cl/781220"}, {"url": "https://groups.google.com/g/golang-announce/c/a082jnz-LvI"}, {"url": "https://pkg.go.dev/vuln/GO-2026-5021"}]}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-05-22T18:43:40.584666Z", "id": "CVE-2026-42508", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-22T18:44:33.483Z"}}]}}

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{}

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