cve-2026-13321

{
  "cvss": 8.6,
  "datePublished": "2026-07-22T15:16:52.200",
  "dateUpdated": "2026-11-02T17:51:27.447",
  "description": "The BIND resolver accepts validly-signed NSEC records where the \"Next Domain Name\" field points outside the signer's zone.\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.",
  "id": "CVE-2026-13321",
  "raw": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "BIND 9",
            "vendor": "ISC",
            "versions": [
              {
                "lessThanOrEqual": "9.18.50",
                "status": "affected",
                "version": "9.11.0",
                "versionType": "custom"
              },
              {
                "lessThanOrEqual": "9.20.24",
                "status": "affected",
                "version": "9.20.0",
                "versionType": "custom"
              },
              {
                "lessThanOrEqual": "9.21.23",
                "status": "affected",
                "version": "9.21.0",
                "versionType": "custom"
              },
              {
                "lessThanOrEqual": "9.18.50-S1",
                "status": "affected",
                "version": "9.11.3-S1",
                "versionType": "custom"
              },
              {
                "lessThanOrEqual": "9.20.24-S1",
                "status": "affected",
                "version": "9.20.9-S1",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "security-officer@isc.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
                "matchCriteriaId": "0BD9C8C0-B51C-4826-9A67-560E5B3F1C24",
                "versionEndIncluding": "9.18.50",
                "versionStartIncluding": "9.11.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:*",
                "matchCriteriaId": "22CF447E-BD05-4B2D-B570-7C138D2C2A7C",
                "versionEndIncluding": "9.18.50",
                "versionStartIncluding": "9.11.3",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
                "matchCriteriaId": "080D7F98-9784-4586-8ADA-CAAA0A9EC180",
                "versionEndIncluding": "9.20.24",
                "versionStartIncluding": "9.20.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:*",
                "matchCriteriaId": "AA853047-029C-4BC6-9C8C-10B183B9FB9E",
                "versionEndIncluding": "9.20.24",
                "versionStartIncluding": "9.20.9",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
                "matchCriteriaId": "769711AE-516A-4D05-997D-55E3DEF5697B",
                "versionEndIncluding": "9.21.23",
                "versionStartIncluding": "9.21.0",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "The BIND resolver accepts validly-signed NSEC records where the \"Next Domain Name\" field points outside the signer's zone.\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1."
      },
      {
        "lang": "es",
        "value": "El resolvedor BIND acepta registros NSEC válidamente firmados donde el campo ’Next Domain Name’ apunta fuera de la zona del firmante.\nEste problema afecta a las versiones de BIND 9 9.11.0 hasta 9.18.50, 9.20.0 hasta 9.20.24, 9.21.0 hasta 9.21.23, 9.11.3-S1 hasta 9.18.50-S1, y 9.20.9-S1 hasta 9.20.24-S1."
      }
    ],
    "id": "CVE-2026-13321",
    "lastModified": "2026-11-02T17:51:27.447",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 4.0,
          "source": "security-officer@isc.org",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-13321",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-07-22T18:51:32.344539Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-07-22T15:16:52.200",
    "references": [
      {
        "source": "security-officer@isc.org",
        "tags": [
          "Product"
        ],
        "url": "https://downloads.isc.org/isc/bind9/9.20.26"
      },
      {
        "source": "security-officer@isc.org",
        "tags": [
          "Product"
        ],
        "url": "https://downloads.isc.org/isc/bind9/9.21.24"
      },
      {
        "source": "security-officer@isc.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://kb.isc.org/docs/cve-2026-13321"
      }
    ],
    "sourceIdentifier": "security-officer@isc.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-346"
          }
        ],
        "source": "security-officer@isc.org",
        "type": "Secondary"
      }
    ]
  },
  "severity": "HIGH",
  "source": "nvd",
  "title": "The BIND resolver accepts validly-signed NSEC records where the \"Next Domain Name\" field points outside the signer's ..."
}