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flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `permittedSubtrees`. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure."},{"lang":"es","value":"Se encontró una falla en gnutls. Esta vulnerabilidad ocurre porque gnutls realiza comparaciones que distinguen entre mayúsculas y minúsculas de las etiquetas ’nameConstraints’, específicamente para las restricciones ’dNSName’ (DNS) o ’rfc822Name’ (correo electrónico) dentro de ’excludedSubtrees’ o ’permittedSubtrees’. Un atacante remoto puede explotar esto al crear un certificado hoja con diferencias en el uso de mayúsculas y minúsculas en el Subject Alternative Name (SAN), lo que lleva a una elusión de política donde un certificado que debería ser rechazado es, en cambio, aceptado. Esto podría resultar en acceso no autorizado o revelación de información."}],"id":"CVE-2026-3833","lastModified":"2026-11-05T22:18:41.977","metrics":{"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"exploitabilityScore":3.9,"impactScore":2.5,"source":"secalert@redhat.com","type":"Secondary"},{"cvssData":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"exploitabilityScore":2.2,"impactScore":5.2,"source":"nvd@nist.gov","type":"Primary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2026-3833","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA 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