CVE-2026-33261

{
  "id": "CVE-2026-33261",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-22T10:16:51.857",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service."
    },
    {
      "lang": "es",
      "value": "Una transición de zona de NSEC a NSEC3 podría desencadenar una inconsistencia interna y causar una denegación de servicio."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "PowerDNS",
          "product": "Recursor",
          "defaultStatus": "unaffected",
          "collectionURL": "https://repo.powerdns.com/",
          "packageName": "pdns-recursor",
          "modules": [
            "Aggressive use of NSEC cache"
          ],
          "programFiles": [
            "aggressive_nsec.cc"
          ],
          "repo": "https://github.com/PowerDNS/pdns",
          "versions": [
            {
              "version": "5.4.0",
              "lessThan": "5.4.1",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.3.0",
              "lessThan": "5.3.6",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.2.0",
              "lessThan": "5.2.9",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-22T17:52:56.932119Z",
          "id": "CVE-2026-33261",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-353"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.2.0",
              "versionEndExcluding": "5.2.9",
              "matchCriteriaId": "EBDA7C62-FAD4-470C-A6FE-4CF19B0BD4AD"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.3.0",
              "versionEndExcluding": "5.3.6",
              "matchCriteriaId": "9F7AC884-348F-47B1-8853-49BFEDBEA9EA"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:powerdns:recursor:5.4.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "4B201BAD-5A74-45E9-91FD-5E950BA18BF3"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html",
      "source": "[email protected]",
      "tags": [
        "Broken Link",
        "Vendor Advisory"
      ]
    }
  ]
}