{
  "document": {
    "aggregate_severity": {
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: Name constraints bypass when prior CAs have only\n     excluded constraints\n     - debian/patches/CVE-2026-42011.patch: remove the empty-permitted early\n       return in name_constraints_node_list_intersect in\n       lib/x509/name_constraints.c so permitted name constraints of a\n       subsequent CA still propagate when previous CAs only carried excluded\n       constraints; also backport the upstream regression suites to\n       tests/name-constraints-merge.c\n     - CVE-2026-42011\n   * SECURITY UPDATE: Certificate validation bypass via oversized subject\n     alternative name\n     - debian/patches/CVE-2026-42013.patch: refactor the CN and DN-email\n       fallback logic and disable the fallback when\n       gnutls_x509_crt_get_subject_alt_name reports an oversized SAN\n       (GNUTLS_E_SHORT_MEMORY_BUFFER) in gnutls_x509_crt_check_hostname2 and\n       gnutls_x509_crt_check_email (lib/x509/hostname-verify.c,\n       lib/x509/email-verify.c); also backport the upstream regression tests to\n       tests/hostname-check.c and tests/cert-tests/email (with\n       tests/cert-tests/email-certs/oversized-san.pem)\n     - CVE-2026-42013\n   * SECURITY UPDATE: CN fallback not precluded by URI or SRV subject\n     alternative names\n     - debian/patches/CVE-2026-42012.patch: add GNUTLS_SAN_URI and\n       GNUTLS_SAN_OTHERNAME_SRV to the PRECLUDES_CN_FALLBACK macro in\n       lib/x509/hostname-verify.c so certificates presenting URI or SRV SANs no\n       longer allow hostname matching against the common name per RFC 6125\n       6.4.4; backport SRV virtual-SAN awareness (lib/includes/gnutls/gnutls.h.in,\n       lib/x509/common.h, lib/x509/virt-san.c, lib/x509/output.c, lib/x509/x509.c)\n       and the get_alt_name othername virtualization fix so SRV othernames are\n       recognized on 3.6.13; also backport the upstream regression tests to\n       tests/hostname-check.c\n     - CVE-2026-42012",
        "title": "Details"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1784559374",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1784559374"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu20.04els/advisories/2026/clsa-2026_1784559374.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-07-20T14:58:05Z",
      "generator": {
        "date": "2026-07-20T14:58:05Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1784559374",
      "initial_release_date": "2026-07-20T14:58:05Z",
      "revision_history": [
        {
          "date": "2026-07-20T14:58:05Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-42011, CVE-2026-42012, CVE-2026-42013"
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        "id": "CWE-1284",
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        {
          "category": "description",
          "text": "A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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          "category": "none_available",
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            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
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          "title": "Vulnerability description"
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          "category": "general",
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          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1784559374"
        },
        {
          "category": "none_available",
          "date": "2026-05-26T22:16:00Z",
          "details": "Affected",
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N",
            "version": "3.1"
          },
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      ],
      "threats": [
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          "category": "impact",
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    {
      "cve": "CVE-2026-42011",
      "cwe": {
        "id": "CWE-295",
        "name": "Improper Certificate Validation"
      },
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-42011"
        }
      ],
      "release_date": "2026-05-07T15:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-20T14:56:19.819880Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1784559374",
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          "category": "none_available",
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}