CVE-2026-3039

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.

Affected Software

Weaknesses

• CWE-771: CWE-771 Missing Reference to Active Allocated Resource

Workarounds

No workarounds known.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation

Additional References

• https://access.redhat.com/security/cve/CVE-2026-3039
• https://bugzilla.redhat.com/show_bug.cgi?id=2479767
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3039.json
• https://access.redhat.com/errata/RHSA-2026:24338
• https://access.redhat.com/errata/RHSA-2026:24339
• https://access.redhat.com/errata/RHSA-2026:23360
• https://access.redhat.com/errata/RHSA-2026:24367
• https://access.redhat.com/errata/RHSA-2026:24368
• https://access.redhat.com/errata/RHSA-2026:20334

References

• https://kb.isc.org/docs/cve-2026-3039
• https://downloads.isc.org/isc/bind9/9.18.49
• https://downloads.isc.org/isc/bind9/9.20.23
• https://downloads.isc.org/isc/bind9/9.21.22

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