Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison_CVE-2026-3833

{
    "lastseen": "",
    "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.",
    "published": "2026-04-30T17:37:05.818Z",
    "modified": "2026-04-30T17:37:05.818Z",
    "type": "cve",
    "title": "Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison",
    "source": "redhat",
    "references": "https://access.redhat.com/security/cve/CVE-2026-3833\nhttps://bugzilla.redhat.com/show_bug.cgi?id=2445763\nhttps://gitlab.com/gnutls/gnutls/-/issues/1803",
    "id": "CVE-2026-3833",
    "bulletinFamily": "",
    "cwe": [
        "CWE-178"
    ],
    "cvelist": null,
    "sourceData": "",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Red Hat Enterprise Linux 10",
    "version": "",
    "vendor": "Red Hat",
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    "ai_score": 0
}