{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-3833", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-03-09T14:00:51.698Z", "datePublished": "2026-04-30T17:37:05.818Z", "dateUpdated": "2026-09-03T14:24:57.121Z" }, "containers": { "cna": { "title": "Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison", "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": 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" }, "format": "CVSS" } ], "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." } ], "affected": [ { "versions": [ { "status": "affected", "version": "0", "lessThan": "3.8.13", "versionType": "semver" } ], "packageName": "gnutls", "collectionURL": "https://gitlab.com/gnutls/gnutls", "defaultStatus": "unaffected" }, { "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": 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