CVE-2026-42013

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42013", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-04-23T11:23:46.517Z", "datePublished": "2026-05-26T21:29:32.887Z", "dateUpdated": "2026-11-11T12:41:33.254Z"}, "containers": {"cna": {"title": "Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name", "metrics": [{"other": {"content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks."}], "affected": [{"versions": [{"status": "affected", "version": "0"}], "packageName": "gnutls", "collectionURL": "https://gitlab.com/gnutls/gnutls"}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "gnutls", "defaultStatus": "affected", "versions": [{"version": "0:3.8.10-4.el10_2", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/o:redhat:enterprise_linux:10.2"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "gnutls", "defaultStatus": "affected", "versions": [{"version": "0:3.8.9-9.el10_0.19", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": 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[{"lang": "en", "value": "A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks."}, {"lang": "es", "value": "Se descubri\u00f3 un fallo en gnutls. Al validar certificados, un Subject Alternative Name (SAN) de tama\u00f1o excesivo podr\u00eda hacer que el proceso de validaci\u00f3n recurriera incorrectamente a la comprobaci\u00f3n del campo Common Name (CN). Esto podr\u00eda permitir a un atacante remoto eludir la validaci\u00f3n correcta del certificado, lo que podr\u00eda conducir a ataques de suplantaci\u00f3n de identidad o man-in-the-middle."}], "id": "CVE-2026-42013", "lastModified": "2026-11-11T13:17:26.887", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42013", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-28T14:13:44.668002Z", "version": "2.0.3"}}]}, "published": "2026-05-26T22:16:42.050", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:13274"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20611"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20612"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20613"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:26319"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:26409"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:29197"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:30004"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:30849"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:30850"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:32962"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:33125"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:40762"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:41921"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:43575"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:56853"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:57483"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:58981"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:59831"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:60019"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:72502"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:74674"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:82304"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:82322"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:82347"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:82354"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:82372"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:82857"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:82888"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:89197"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:89232"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:89333"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:95508"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:95745"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:95755"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-42013"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467448"}, {"source": "secalert@redhat.com", "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-8"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

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