CVE-2026-13321

HIGH

8.6

CVSS v3

Description

The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

CWE-346

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.16.50-1~deb11u6CVE-2026-13321

Fixed in:1:9.18.49-1~deb12u2CVE-2026-13321

Fixed in:1:9.20.26-1~deb13u1CVE-2026-13321

Fixed in:1:9.20.26-1CVE-2026-13321

bindRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

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

bindRocky

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

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

bind-chrootRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

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_2.10RHSA-2026:55437

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

bind-debuginfoRocky

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

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

bind-debuginfoRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

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

bind-debugsourceRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

Fixed in:32:9.11.36-16.el8_10.14RHSA-2026:54654

bind-debugsourceRocky

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

Fixed in:32:9.11.36-16.el8_10.14RHSA-2026:54654

bind-develRocky

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

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

bind-develRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

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_9.21.s390RHSA-2026:60383

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_8.8RHSA-2026:54510

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:32:9.16.23-40.el9_8.8RHSA-2026:54510

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

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

bind-dnssec-utilsRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

Fixed in:32:9.16.23-40.el9_8.8RHSA-2026:54510

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

Fixed in:32:9.16.23-40.el9_8.8RHSA-2026:54510

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

bind-dnssec-utilsRocky

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

Fixed in:32:9.16.23-40.el9_8.8RHSA-2026:54510

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

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

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

bind-dnssec-utils-debuginfoRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

Fixed in:32:9.16.23-40.el9_8.8RHSA-2026:54510

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

Fixed in:32:9.16.23-40.el9_8.8RHSA-2026:54510

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

bind-dnssec-utils-debuginfoRocky

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

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

Fixed in:32:9.16.23-40.el9_8.8RHSA-2026:54510

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

Fixed in:32:9.16.23-40.el9_8.8RHSA-2026:54510

bind-docRocky

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

Fixed in:32:9.16.23-40.el9_8.8RHSA-2026:54510

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

bind-docRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

Fixed in:32:9.16.23-40.el9_8.8RHSA-2026:54510

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

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.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_9.21RHSA-2026:60383

Fixed in:32:9.11.36-16.el8_10.14RHSA-2026:54654

bind-export-develRocky

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

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

Fixed in:32:9.11.36-16.el8_10.14RHSA-2026:54654

bind-export-libsRed 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.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_9.21RHSA-2026:60383

Fixed in:32:9.11.36-16.el8_10.14RHSA-2026:54654

bind-export-libsRocky

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.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:32:9.11.36-16.el8_10.14RHSA-2026:54654

bind-export-libs-debuginfoRed Hat / RHEL

Fixed in:32:9.11.36-16.el8_10.14RHSA-2026:54654

bind-export-libs-debuginfoRocky

Fixed in:32:9.11.36-16.el8_10.14RHSA-2026:54654

bind-libsRocky

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

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.s390RHSA-2026:60383

bind-libsRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

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

bind-libs-debuginfoRed Hat / RHEL

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

Fixed in:32:9.11.36-16.el8_10.14RHSA-2026:54654

bind-libs-debuginfoRocky

Fixed in:32:9.18.33-15.el10_2.10RHSA-2026:55437

Fixed in:32:9.11.36-16.el8_10.14RHSA-2026:54654

bind-libs-liteRed 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.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

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

Fixed in:32:9.11.36-16.el8_10.14RHSA-2026:54654

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

ScopeChanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Other references3

Related Vulnerabilities

Other CWE-346 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-34291	High	8.8	84%	KEV	-
CVE-2009-1185	High	7.2	82%	-	Fix
CVE-2015-4495	High	8.8	71%	KEV	Fix
CVE-2020-16952	High	8.6	71%	-	-
CVE-2023-29711	Critical	9.8	70%	-	-
CVE-2024-23898	High	8.8	67%	-	Fix

Common questions

How do I fix CVE-2026-13321?

Published advisories record a fix for 124 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-2026-13321 being actively exploited?

Not that we know of. CVE-2026-13321 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.22% is the estimated probability that it will be exploited in the next 30 days. That is higher than 13% of all scored CVEs.

How severe is CVE-2026-13321?

CVE-2026-13321 has a CVSS v3 base score of 8.6, 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-2026-13321 affect?

Published advisories record a fix for bind9 (Debian), bind (Red Hat / RHEL), bind (Rocky), bind-chroot (Red Hat / RHEL), and 120 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-2026-13321

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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 2026-07-22.