CVE-2026-3039 (GCVE-0-2026-3039)

Vulnerability from cvelistv5 – Published: 2026-05-20 13:09 – Updated: 2026-07-15 01:10
VLAI
Title
BIND 9 server memory exhaustion during GSS-API TKEY negotiation
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-20 13:42 UTC
CWE
  • CWE-771 - Missing Reference to Active Allocated Resource
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
isc
References
Impacted products
Vendor Product Version
ISC BIND 9 Affected: 9.0.0 , ≤ 9.16.50 (custom)
Affected: 9.18.0 , ≤ 9.18.48 (custom)
Affected: 9.20.0 , ≤ 9.20.22 (custom)
Affected: 9.21.0 , ≤ 9.21.21 (custom)
Affected: 9.9.3-S1 , ≤ 9.16.50-S1 (custom)
Affected: 9.18.11-S1 , ≤ 9.18.48-S1 (custom)
Affected: 9.20.9-S1 , ≤ 9.20.22-S1 (custom)
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 32:9.18.33-15.el10_2.2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8 Unaffected: 32:9.16.23-0.22.el8_10.6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 32:9.11.36-16.el8_10.8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
    cpe:/o:redhat:enterprise_linux:8
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 32:9.16.23-40.el9_8.2 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 32:9.18.29-14.el9_8.2 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
 Create a notification for this product.
Red Hat Red Hat Hardened Images Unaffected: 9.18.49-1.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
 Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
 Create a notification for this product.
Date Public
2026-05-20 00:00
Credits
ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention.
Show details on NVD website
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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.\"},{\"lang\":\"es\",\"value\":\"Los servidores BIND que est\u00e1n configurados para usar autenticaci\u00f3n basada en TKEY a trav\u00e9s de tokens GSS-API son vulnerables al consumo excesivo de memoria al recibir y procesar paquetes construidos maliciosamente. T\u00edpicamente, estos servidores se encontrar\u00e1n en implementaciones DNS integradas con Active Directory y/o entornos DNS protegidos con Kerberos.\\nEste problema afecta a las versiones de BIND 9 9.0.0 a 9.16.50, 9.18.0 a 9.18.48, 9.20.0 a 9.20.22, 9.21.0 a 9.21.21, 9.9.3-S1 a 9.16.50-S1, 9.18.11-S1 a 9.18.48-S1, y 9.20.9-S1 a 9.20.22-S1.\"}],\"affected\":[{\"source\":\"security-officer@isc.org\",\"affectedData\":[{\"vendor\":\"ISC\",\"product\":\"BIND 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      "product_status:fixed": "466",
      "product_status:known_affected": "25",
      "product_status:known_not_affected": "5",
      "source": "Red Hat CSAF VEX",
      "status": "final",
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      "product_status:recommended": "275",
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      "status": "interim",
      "title": "SUSE CVE CVE-2026-3039",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-3039.json",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.