Bug 2504166 (CVE-2026-13321)

Summary:	CVE-2026-13321 bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, security-response-team, sghai, sidsharm, suppawar, teagle, vlaad, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2524374, 2524373
Bug Blocks:
Deadline:	2026-07-22

Description OSIDB Bzimport 2026-07-21 19:47:52 UTC

The resolver accepts validly-signed NSEC records where the "Next
  Domain Name" field points outside the signer's zone. An attacker
  controlling ANY DNSSEC-signed zone can craft NSEC records spanning
  into victim zones, enabling cross-zone cache poisoning with AD=1
  (Authenticated Data flag set)

Comment 3 errata-xmlrpc 2026-08-13 10:52:51 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:54509 https://access.redhat.com/errata/RHSA-2026:54509

Comment 4 errata-xmlrpc 2026-08-13 11:02:25 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:54510 https://access.redhat.com/errata/RHSA-2026:54510

Comment 5 errata-xmlrpc 2026-08-13 17:48:06 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:54654 https://access.redhat.com/errata/RHSA-2026:54654

Comment 6 errata-xmlrpc 2026-08-17 03:44:35 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:55441 https://access.redhat.com/errata/RHSA-2026:55441

Comment 7 errata-xmlrpc 2026-08-17 04:19:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:55437 https://access.redhat.com/errata/RHSA-2026:55437

Comment 8 errata-xmlrpc 2026-08-17 05:45:18 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:55442 https://access.redhat.com/errata/RHSA-2026:55442

Comment 9 errata-xmlrpc 2026-08-19 23:36:50 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:57189 https://access.redhat.com/errata/RHSA-2026:57189

Comment 10 errata-xmlrpc 2026-08-25 13:47:41 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.22

Via RHSA-2026:57362 https://access.redhat.com/errata/RHSA-2026:57362

Comment 11 errata-xmlrpc 2026-08-26 19:44:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:60383 https://access.redhat.com/errata/RHSA-2026:60383

Comment 13 errata-xmlrpc 2026-09-10 08:51:00 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.16

Via RHSA-2026:62549 https://access.redhat.com/errata/RHSA-2026:62549

Comment 16 Jon Orris 2026-09-17 07:56:36 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.18

Via RHSA-2026:65851 https://access.redhat.com/errata/RHSA-2026:65851

Comment 17 Jon Orris 2026-10-01 12:29:02 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.17

Via RHSA-2026:70586 https://access.redhat.com/errata/RHSA-2026:70586

Comment 18 Jon Orris 2026-10-01 15:25:22 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.18

Via RHSA-2026:70615 https://access.redhat.com/errata/RHSA-2026:70615

Comment 22 Jon Orris 2026-10-08 12:59:59 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:79160 https://access.redhat.com/errata/RHSA-2026:79160

Comment 23 Jon Orris 2026-10-12 01:20:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:80501 https://access.redhat.com/errata/RHSA-2026:80501