CVE-2026-12617

{
  "id": "CVE-2026-12617",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-22T15:16:51.963",
  "lastModified": "2026-10-24T18:10:00.163",
  "vulnStatus": "Undergoing Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1."
    },
    {
      "lang": "es",
      "value": "El problema es la terminación inesperada del programa basada en el orden y/o el contenido específico en las respuestas a las consultas de registros CNAME o DNAME, y registros A. Específicamente, si un cliente consulta por un registro DNAME y un registro A por debajo del DNAME al resolvedor, y el servidor autoritativo responde positivamente a la consulta A pero retrasa la respuesta DNAME y luego responde negativamente, ’named’ puede cerrarse inesperadamente. O, si un cliente consulta por un registro CNAME y un registro A para el mismo nombre al resolvedor, y el servidor autoritativo responde positivamente a la consulta A pero retrasa la respuesta CNAME y luego responde con un CNAME autorreferencial, la misma falla puede ocurrir.\nEste problema afecta a las versiones de BIND 9 9.18.0 a 9.18.50, 9.20.0 a 9.20.24, 9.18.11-S1 a 9.18.50-S1, y 9.20.9-S1 a 9.20.24-S1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "ISC",
          "product": "BIND 9",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "9.18.0",
              "lessThanOrEqual": "9.18.50",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "9.20.0",
              "lessThanOrEqual": "9.20.24",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "9.18.11-S1",
              "lessThanOrEqual": "9.18.50-S1",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "9.20.9-S1",
              "lessThanOrEqual": "9.20.24-S1",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-22T18:48:06.430818Z",
          "id": "CVE-2026-12617",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://downloads.isc.org/isc/bind9/9.20.26",
      "source": "[email protected]"
    },
    {
      "url": "https://kb.isc.org/docs/cve-2026-12617",
      "source": "[email protected]"
    }
  ]
}