{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0"
            }
          ],
          "repo": "https://gitlab.com/gnutls/gnutls",
          "type": "GIT"
        }
      ],
      "versions": [
        "0"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "redhat",
    "cwe_ids": [
      "CWE-295"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42011.json"
  },
  "details": "A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.",
  "id": "CVE-2026-42011",
  "modified": "2026-10-16T02:31:19.081045294Z",
  "published": "2026-05-07T13:51:04.695Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://access.redhat.com/downloads/content/package-browser/"
    },
    {
      "type": "WEB",
      "url": "https://catalog.redhat.com/software/containers/"
    },
    {
      "type": "WEB",
      "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:13274"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:20611"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:20612"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:20613"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:26319"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:26409"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:29197"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:30004"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:30849"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:30850"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:32962"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:33125"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:40762"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:41921"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:43575"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:56853"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:57483"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:58981"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:59831"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:60019"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:72502"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:74674"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:82304"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:82322"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:82347"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:82354"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:82372"
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    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:82857"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:82888"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-42011"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42011.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42011"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467437"
    },
    {
      "type": "PACKAGE",
      "url": "https://gitlab.com/gnutls/gnutls"
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  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Gnutls: gnutls: security bypass due to incorrect name constraint handling"
}