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Description

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.

PUBLISHED Reserved 2026-02-23 | Published 2026-05-20 | Updated 2026-05-20 | Assigner isc




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-771 Missing Reference to Active Allocated Resource

Product status

Default status
unaffected

9.0.0 (custom)
affected

9.18.0 (custom)
affected

9.20.0 (custom)
affected

9.21.0 (custom)
affected

9.9.3-S1 (custom)
affected

9.18.11-S1 (custom)
affected

9.20.9-S1 (custom)
affected

Credits

ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention.

References

kb.isc.org/docs/cve-2026-3039 (CVE-2026-3039) vendor-advisory

downloads.isc.org/isc/bind9/9.18.49 patch

downloads.isc.org/isc/bind9/9.20.23 patch

downloads.isc.org/isc/bind9/9.21.22 patch

cve.org (CVE-2026-3039)

nvd.nist.gov (CVE-2026-3039)

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