Cyber Resilience

CVE-2026-3039

High

Published: 20 May 2026

Published
20 May 2026
Modified
21 May 2026
KEV Added
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Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0056 42.0th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-3039 is a high-severity Missing Reference to Active Allocated Resource (CWE-771) vulnerability in Isc Bind. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 42.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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.…

more

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.

CWE(s)
CWE-771

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
Why these techniques?

Remote exploitation of public-facing BIND DNS service (T1190) via crafted packets directly enables application exhaustion leading to DoS (T1499.004).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2026-3104Same product: Isc Bind
CVE-2026-1519Same product: Isc Bind
CVE-2026-5946Same product: Isc Bind
CVE-2026-5947Same product: Isc Bind
CVE-2026-3593Same product: Isc Bind
CVE-2026-20004Shared CWE-771

Affected Assets

isc
bind
9.0.0 — 9.16.50 · 9.18.0 — 9.18.49 · 9.20.0 — 9.20.23

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References