CVE-2026-3039 (GCVE-0-2026-3039)
Vulnerability from cvelistv5
Published
2026-05-20 13:09
Modified
2026-05-20 13:43
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-771 - Missing Reference to Active Allocated Resource
Summary
BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processing maliciously-constructed packets. Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments. This issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
References
Impacted products
Vendor Product Version
ISC BIND 9 Version: 9.0.0   <
Version: 9.18.0   <
Version: 9.20.0   <
Version: 9.21.0   <
Version: 9.9.3-S1   <
Version: 9.18.11-S1   <
Version: 9.20.9-S1   <
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            "other": {
              "content": {
                "id": "CVE-2026-3039",
                "options": [
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                  },
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                  },
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                "role": "CISA Coordinator",
                "timestamp": "2026-05-20T13:42:49.621351Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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      "credits": [
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          "lang": "en",
          "value": "ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention."
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      "descriptions": [
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          "value": "BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processing maliciously-constructed packets.  Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments.\nThis issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1."
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            }
          ]
        }
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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      "providerMetadata": {
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        "orgId": "404fd4d2-a609-4245-b543-2c944a302a22",
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      "references": [
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          "name": "CVE-2026-3039",
          "tags": [
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          "url": "https://kb.isc.org/docs/cve-2026-3039"
        },
        {
          "tags": [
            "patch"
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          "url": "https://downloads.isc.org/isc/bind9/9.18.49"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://downloads.isc.org/isc/bind9/9.20.23"
        },
        {
          "tags": [
            "patch"
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          "url": "https://downloads.isc.org/isc/bind9/9.21.22"
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      "solutions": [
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          "lang": "en",
          "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.18.49, 9.20.23, 9.21.22, 9.18.49-S1, or 9.20.23-S1."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "BIND 9 server memory exhaustion during GSS-API TKEY negotiation",
      "workarounds": [
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          "lang": "en",
          "value": "No workarounds known."
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    "dateReserved": "2026-02-23T16:28:45.411Z",
    "dateUpdated": "2026-05-20T13:43:00.275Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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