CVE-2026-3039

HIGH

7.5

CVSS v3

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.

CWE-771 CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.16.50-1~deb11u6CVE-2026-3039

Fixed in:1:9.18.49-1~deb12u2CVE-2026-3039

Fixed in:1:9.20.23-1~deb13u1CVE-2026-3039

Fixed in:1:9.20.23-1CVE-2026-3039

bindRocky

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

bindRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

bind-chrootRocky

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

bind-chrootRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

bind-debuginfoRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.s390RHSA-2026:60383

bind-debuginfoRocky

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.4-26.P2.el7_9.21.ppcRHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

bind-debugsourceRocky

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

bind-debugsourceRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

bind-develRocky

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppcRHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

bind-develRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

bind-dnssec-docRed Hat / RHEL

Fixed in:32:9.16.23-40.el9_8.2RHSA-2026:24367

Fixed in:32:9.16.23-18.el9_4.12RHSA-2026:57189

Fixed in:32:9.16.23-31.el9_6.4RHSA-2026:55441

bind-dnssec-docRocky

Fixed in:32:9.16.23-31.el9_6.4RHSA-2026:55441

Fixed in:32:9.16.23-40.el9_8.2RHSA-2026:24367

Fixed in:32:9.16.23-18.el9_4.12RHSA-2026:57189

bind-dnssec-utilsRocky

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.16.23-40.el9_8.2RHSA-2026:24367

Fixed in:32:9.16.23-18.el9_4.12RHSA-2026:57189

Fixed in:32:9.16.23-31.el9_6.4RHSA-2026:55441

bind-dnssec-utilsRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.16.23-31.el9_6.4RHSA-2026:55441

Fixed in:32:9.16.23-18.el9_4.12RHSA-2026:57189

Fixed in:32:9.16.23-31.el9_6.4RHSA-2026:55441

bind-dnssec-utils-debuginfoRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.16.23-31.el9_6.4RHSA-2026:55441

Fixed in:32:9.16.23-40.el9_8.2RHSA-2026:24367

Fixed in:32:9.16.23-31.el9_6.4RHSA-2026:55441

bind-dnssec-utils-debuginfoRocky

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.16.23-18.el9_4.12RHSA-2026:57189

Fixed in:32:9.16.23-31.el9_6.4RHSA-2026:55441

bind-docRocky

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.16.23-40.el9_8.2RHSA-2026:24367

Fixed in:32:9.16.23-31.el9_6.4RHSA-2026:55441

bind-docRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.16.23-31.el9_6.4RHSA-2026:55441

Fixed in:32:9.16.23-40.el9_8.2RHSA-2026:24367

bind-export-develRed Hat / RHEL

Fixed in:32:9.11.4-26.P2.el7_9.21.s390RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppcRHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

bind-export-develRocky

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppcRHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.s390RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

bind-export-libsRocky

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.s390RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppcRHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

bind-export-libsRed Hat / RHEL

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.s390RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppcRHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

bind-export-libs-debuginfoRocky

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

bind-export-libs-debuginfoRed Hat / RHEL

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

bind-libsRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.4-26.P2.el7_9.21.ppcRHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.s390RHSA-2026:60383

bind-libsRocky

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppcRHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

bind-libs-debuginfoRocky

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

bind-libs-debuginfoRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.2RHSA-2026:24338

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

bind-libs-liteRocky

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppc64RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.ppcRHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21.s390RHSA-2026:60383

Fixed in:32:9.11.4-26.P2.el7_9.21RHSA-2026:60383

Fixed in:32:9.11.36-16.el8_10.8RHSA-2026:24339

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.05%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% of all known CVEs.

References

Patch3

Vendor Advisory1

kb.isc.org

Other references12

Related Vulnerabilities

Other CWE-771 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-34720	High	8.6	1.3%	-	Fix
CVE-2023-20244	High	8.6	0.8%	-	-
CVE-2024-56343	Medium	4.3	0.3%	-	-
CVE-2026-20004	High	7.4	0.2%	-	-
CVE-2025-21090	Medium	6.5	0.1%	-	Fix

Common questions

How do I fix CVE-2026-3039?

Published advisories record a fix for 116 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-3039 being actively exploited?

Not that we know of. CVE-2026-3039 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.0% is the estimated probability that it will be exploited in the next 30 days. That is higher than 62% of all scored CVEs.

How severe is CVE-2026-3039?

CVE-2026-3039 has a CVSS v3 base score of 7.5, rated important. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-3039 affect?

Published advisories record a fix for bind9 (Debian), bind (Rocky), bind (Red Hat / RHEL), bind-chroot (Rocky), and 112 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-3039

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-27.