CVE-2026-3039 — BIND 9 server memory exhaustion during GSS-API TKEY negotiation

Description (CNA)

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 (CNA)

Vendor / product	Versions
ISC / BIND 9	affected 9.0.0 through 9.16.50; affected 9.18.0 through 9.18.48; affected 9.20.0 through 9.20.22; affected 9.21.0 through 9.21.21; affected 9.9.3-S1 through 9.16.50-S1; affected 9.18.11-S1 through 9.18.48-S1; affected 9.20.9-S1 through 9.20.22-S1

CWE

CWE-771

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending maliciously-constructed packets to BIND servers configured for TKEY-based authentication via GSS-API (Generic Security Service Application Program Interface) tokens. This can lead to excessive memory consumption, resulting in a Denial of Service (DoS) for the affected server.