{"id":"CVE-2026-3833","state":"PUBLISHED","title":"Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison","description":"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.","publishedAt":"2026-04-30T17:37:05.818Z","updatedAt":"2026-10-14T19:24:09.620Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","source":"redhat"},"assigner":"redhat","products":["gnutls","Red Hat Red Hat Enterprise Linux 10","Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support","Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support","Red Hat Red Hat Enterprise Linux 8","Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support","Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On","Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support","Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On","Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service","Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions","Red Hat 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