{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-5947",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-5947",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-05-20T13:10:11.873Z",
    "updatedAt": "2026-09-01T12:05:00.589Z",
    "importedAt": "2026-10-24T01:58:20.586Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "SIG(0) validation during query flood may lead to undefined behavior",
      "summary": "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.",
      "affected": [
        {
          "vendor": "ISC",
          "product": "BIND 9",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "9.20.0",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "9.20.22"
            },
            {
              "version": "9.21.0",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "9.21.21"
            },
            {
              "version": "9.20.9-S1",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "9.20.22-S1"
            },
            {
              "version": "9.18.28",
              "status": "unaffected",
              "versionType": "custom",
              "lessThanOrEqual": "9.18.49"
            },
            {
              "version": "9.18.28-S1",
              "status": "unaffected",
              "versionType": "custom",
              "lessThanOrEqual": "9.18.49-S1"
            }
          ]
        }
      ]
    }
  }
}