CVE-2026-3833

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["cpe:/a:redhat:rhui:5::el9"], "vendor": "Red Hat", "product": "Red Hat Update Infrastructure 5", "versions": [{"status": "unaffected", "version": "1787241260", "lessThan": "*", "versionType": "rpm"}], "packageName": "rhui5/rhua-tp-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "packageName": "gnutls", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:openshift:4"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "packageName": "openshift4/ose-hypershift-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unknown"}]}], "published": "2026-04-30T18:16:30.577", "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:13274", "tags": ["Issue Tracking", "Third Party Advisory"], "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-2026:41921", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:43575", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:57402", "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-2026:62409", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:62549", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:65839", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:65851", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:67857", "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/security/cve/CVE-2026-3833", "tags": ["Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445763", "tags": ["Issue Tracking", "Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://gitlab.com/gnutls/gnutls/-/issues/1803", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "source": "secalert@redhat.com"}, {"url": "https://gitlab.com/gnutls/gnutls/-/issues/1803", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-178"}]}], "descriptions": [{"lang": "en", "value": "A 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 encontr\u00f3 una falla en gnutls. Esta vulnerabilidad ocurre porque gnutls realiza comparaciones que distinguen entre may\u00fasculas y min\u00fasculas de las etiquetas \u2019nameConstraints\u2019, espec\u00edficamente para las restricciones \u2019dNSName\u2019 (DNS) o \u2019rfc822Name\u2019 (correo electr\u00f3nico) dentro de \u2019excludedSubtrees\u2019 o \u2019permittedSubtrees\u2019. Un atacante remoto puede explotar esto al crear un certificado hoja con diferencias en el uso de may\u00fasculas y min\u00fasculas en el Subject Alternative Name (SAN), lo que lleva a una elusi\u00f3n de pol\u00edtica donde un certificado que deber\u00eda ser rechazado es, en cambio, aceptado. Esto podr\u00eda resultar en acceso no autorizado o revelaci\u00f3n de informaci\u00f3n."}], "lastModified": "2026-10-26T21:10:00.170", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:gnu:gnutls:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "33A22858-21E1-479F-A9C4-AD2EFD059B93"}, {"criteria": "cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "87DEB507-5B64-47D7-9A50-3B87FD1E571F"}, {"criteria": "cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "932D137F-528B-4526-9A89-CD59FA1AB0FE"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2F6AB192-9D7D-4A9A-8995-E53A9DE9EAFC"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}