CVE-2026-3039

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.

CVSS breakdown

Affected products

• ISC / BIND9.0.0 – 9.16.50
• ISC / BIND 99.18.0 – 9.18.48
• ISC / BIND 99.20.0 – 9.20.22
• ISC / BIND 99.21.0 – 9.21.21
• ISC / BIND 99.0.0 – 9.16.50
• ISC / BIND 99.18.11-S1 – 9.18.48-S1
• ISC / BIND 99.20.9-S1 – 9.20.22-S1
• ISC / BIND 99.9.3-S1 – 9.16.50-S1

References

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