{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
                "range": [
                  {
                    "introduced": "9.18.0"
                  },
                  {
                    "last_affected": "9.18.50"
                  }
                ],
                "source": "CPE_RANGE"
              },
              {
                "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:*",
                "range": [
                  {
                    "introduced": "9.18.11"
                  },
                  {
                    "last_affected": "9.18.50"
                  }
                ],
                "source": "CPE_RANGE"
              },
              {
                "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
                "range": [
                  {
                    "introduced": "9.20.0"
                  },
                  {
                    "last_affected": "9.20.24"
                  }
                ],
                "source": "CPE_RANGE"
              },
              {
                "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:*",
                "range": [
                  {
                    "introduced": "9.20.9"
                  },
                  {
                    "last_affected": "9.20.24"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          "events": [
            {
              "introduced": "8db45afa1affcb823e68afdeddedf93e136f5d3e"
            },
            {
              "last_affected": "ad1a84a99f853f5194ec0afc52a152f2b9579074"
            },
            {
              "introduced": "1f554acee8df440c2fc211f976b196b31b9c9284"
            },
            {
              "last_affected": "ad1a84a99f853f5194ec0afc52a152f2b9579074"
            },
            {
              "introduced": "14bbdfc7b9db0870a0b8941ca8812d9983fdba1a"
            },
            {
              "last_affected": "e5d43f1764259da929f6c0200a9db2081141998a"
            },
            {
              "introduced": "98f2a5b7f486829b5644e5e9d6119c8cfefcdf70"
            },
            {
              "last_affected": "e5d43f1764259da929f6c0200a9db2081141998a"
            }
          ],
          "repo": "https://github.com/isc-projects/bind9",
          "type": "GIT"
        }
      ]
    },
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
                "range": [
                  {
                    "introduced": "9.18.0"
                  },
                  {
                    "last_affected": "9.18.50"
                  }
                ],
                "source": "CPE_RANGE"
              },
              {
                "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:*",
                "range": [
                  {
                    "introduced": "9.18.11"
                  },
                  {
                    "last_affected": "9.18.50"
                  }
                ],
                "source": "CPE_RANGE"
              },
              {
                "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
                "range": [
                  {
                    "introduced": "9.20.0"
                  },
                  {
                    "last_affected": "9.20.24"
                  }
                ],
                "source": "CPE_RANGE"
              },
              {
                "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:*",
                "range": [
                  {
                    "introduced": "9.20.9"
                  },
                  {
                    "last_affected": "9.20.24"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          "events": [
            {
              "introduced": "8db45afa1affcb823e68afdeddedf93e136f5d3e"
            },
            {
              "last_affected": "ad1a84a99f853f5194ec0afc52a152f2b9579074"
            },
            {
              "introduced": "1f554acee8df440c2fc211f976b196b31b9c9284"
            },
            {
              "last_affected": "ad1a84a99f853f5194ec0afc52a152f2b9579074"
            },
            {
              "introduced": "14bbdfc7b9db0870a0b8941ca8812d9983fdba1a"
            },
            {
              "last_affected": "e5d43f1764259da929f6c0200a9db2081141998a"
            },
            {
              "introduced": "98f2a5b7f486829b5644e5e9d6119c8cfefcdf70"
            },
            {
              "last_affected": "e5d43f1764259da929f6c0200a9db2081141998a"
            }
          ],
          "repo": "https://gitlab.isc.org/isc-projects/bind9",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {},
  "details": "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.",
  "id": "CVE-2026-12617",
  "modified": "2026-11-04T02:30:32.836666797Z",
  "published": "2026-07-22T15:16:51.963Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://downloads.isc.org/isc/bind9/9.20.26"
    },
    {
      "type": "ADVISORY",
      "url": "https://kb.isc.org/docs/cve-2026-12617"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}