{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
            "extracted_events": [
              {
                "introduced": "9.20.0"
              },
              {
                "fixed": "9.20.23"
              },
              {
                "introduced": "9.21.0"
              },
              {
                "fixed": "9.21.22"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "14bbdfc7b9db0870a0b8941ca8812d9983fdba1a"
            },
            {
              "fixed": "7d0b4d4d436e7b950225a533e5bc56d8f935cc1c"
            },
            {
              "introduced": "b732da695eecc0526950e2c722cde0bf23e5a070"
            },
            {
              "fixed": "02a7b2c8a549b79cf885d1a0cda28b74de22d197"
            }
          ],
          "repo": "https://github.com/isc-projects/bind9",
          "type": "GIT"
        }
      ]
    },
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
            "extracted_events": [
              {
                "introduced": "9.20.0"
              },
              {
                "fixed": "9.20.23"
              },
              {
                "introduced": "9.21.0"
              },
              {
                "fixed": "9.21.22"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "14bbdfc7b9db0870a0b8941ca8812d9983fdba1a"
            },
            {
              "fixed": "7d0b4d4d436e7b950225a533e5bc56d8f935cc1c"
            },
            {
              "introduced": "b732da695eecc0526950e2c722cde0bf23e5a070"
            },
            {
              "fixed": "02a7b2c8a549b79cf885d1a0cda28b74de22d197"
            }
          ],
          "repo": "https://gitlab.isc.org/isc-projects/bind9",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {},
  "details": "Undefined behavior may result due to a race condition leading to a use-after-free violation.  If BIND receives an incoming DNS message signed with SIG(0), it begins work to validate that signature.  If, during that validation, the \"recursive-clients\" limit is reached (as would occur during a query flood), and that same DNS message is discarded per the limit, there is a brief window of time while the SIG(0) validation may attempt to read the now-discarded DNS message.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1.\nBIND 9 versions 9.18.28 through 9.18.49 and 9.18.28-S1 through 9.18.49-S1 are NOT affected.",
  "id": "CVE-2026-5947",
  "modified": "2026-07-08T05:37:39.466834004Z",
  "published": "2026-05-20T13:16:40.303Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-5947"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5947.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:7412"
    },
    {
      "type": "ADVISORY",
      "url": "https://kb.isc.org/docs/cve-2026-5947"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479772"
    },
    {
      "type": "FIX",
      "url": "https://downloads.isc.org/isc/bind9/9.20.23"
    },
    {
      "type": "FIX",
      "url": "https://downloads.isc.org/isc/bind9/9.21.22"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}