CVE-2026-3039

7.5 HIGH

BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when ...

Published: 2026-05-20 · Last updated: 2026-05-21

Severity and scoring

CVSS: 7.5 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-771

Affected products

Vendor	Product
isc	bind

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-3039
[Patch]https://downloads.isc.org/isc/bind9/9.18.49
[Patch]https://downloads.isc.org/isc/bind9/9.20.23
[Patch]https://downloads.isc.org/isc/bind9/9.21.22
[Vendor advisory]https://kb.isc.org/docs/cve-2026-3039

Related CVEs

Same vendor

CVE-2026-5950 — An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthen... (5.3 MEDIUM)
CVE-2026-5947 — Undefined behavior may result due to a race condition leading to a use-after-free violation (7.5 HIGH)
CVE-2026-5946 — Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, ... (7.5 HIGH)
CVE-2026-3593 — A use-after-free vulnerability exists within the DNS-over-HTTPS implementation (7.4 HIGH)
CVE-2026-3592 — BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack (5.3 MEDIUM)