Bug 2504338 (CVE-2026-11721) - CVE-2026-11721 bind: bind9: Cache poisoning via label count discrepancy, RRSIG, wildcards
Summary: CVE-2026-11721 bind: bind9: Cache poisoning via label count discrepancy, RRSI...
Keywords:
Status: NEW
Alias: CVE-2026-11721
Deadline: 2026-07-22
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-21 20:25 UTC by OSIDB Bzimport
Modified: 2026-11-06 04:11 UTC (History)
18 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:56071 0 None None None 2026-08-18 10:19:46 UTC
Red Hat Product Errata RHSA-2026:54509 0 None None None 2026-08-13 10:52:55 UTC
Red Hat Product Errata RHSA-2026:54510 0 None None None 2026-08-13 11:02:23 UTC
Red Hat Product Errata RHSA-2026:54654 0 None None None 2026-08-13 17:48:05 UTC
Red Hat Product Errata RHSA-2026:55437 0 None None None 2026-08-17 04:19:25 UTC
Red Hat Product Errata RHSA-2026:55441 0 None None None 2026-08-17 03:44:39 UTC
Red Hat Product Errata RHSA-2026:55442 0 None None None 2026-08-17 05:45:20 UTC
Red Hat Product Errata RHSA-2026:57189 0 None None None 2026-08-19 23:36:48 UTC
Red Hat Product Errata RHSA-2026:57362 0 None None None 2026-08-25 13:47:44 UTC
Red Hat Product Errata RHSA-2026:60383 0 None None None 2026-08-26 19:44:57 UTC
Red Hat Product Errata RHSA-2026:66357 0 None None None 2026-09-15 09:19:27 UTC
Red Hat Product Errata RHSA-2026:79160 0 None None None 2026-10-08 13:00:01 UTC
Red Hat Product Errata RHSA-2026:80501 0 None None None 2026-10-12 01:20:52 UTC
Red Hat Product Errata RHSA-2026:94115 0 None None None 2026-11-03 01:22:03 UTC
Red Hat Product Errata RHSA-2026:94278 0 None None None 2026-11-03 03:55:06 UTC
Red Hat Product Errata RHSA-2026:95242 0 None None None 2026-11-04 16:01:06 UTC
Red Hat Product Errata RHSA-2026:95435 0 None None None 2026-11-05 07:20:12 UTC
Red Hat Product Errata RHSA-2026:95477 0 None None None 2026-11-05 08:42:11 UTC
Red Hat Product Errata RHSA-2026:95478 0 None None None 2026-11-05 08:54:55 UTC
Red Hat Product Errata RHSA-2026:95727 0 None None None 2026-11-06 04:11:34 UTC

Description OSIDB Bzimport 2026-07-21 20:25:29 UTC 
An attacker's zone can respond with an RRSIG with fewer labels
than the zone it's in, causing named to produce a wildcard name
shorter than the attacker's zone — resulting in cache poisoning.
Requires synth-from-dnssec yes (which IS the default).
Comment 2 errata-xmlrpc 2026-08-13 10:52:54 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 3 errata-xmlrpc 2026-08-13 11:02:22 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 4 errata-xmlrpc 2026-08-13 17:48:04 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 5 errata-xmlrpc 2026-08-17 03:44:38 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 6 errata-xmlrpc 2026-08-17 04:19:24 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 7 errata-xmlrpc 2026-08-17 05:45:19 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 8 errata-xmlrpc 2026-08-19 23:36:48 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 9 errata-xmlrpc 2026-08-25 13:47:43 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 10 errata-xmlrpc 2026-08-26 19:44:56 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 14 Jon Orris 2026-09-15 09:19:25 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.22

Via RHSA-2026:66357 https://access.redhat.com/errata/RHSA-2026:66357
Comment 18 Jon Orris 2026-10-08 13:00:00 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 19 Jon Orris 2026-10-12 01:20:50 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
Comment 20 Jon Orris 2026-11-03 01:22:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:94115 https://access.redhat.com/errata/RHSA-2026:94115
Comment 21 Jon Orris 2026-11-03 03:55:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:94278 https://access.redhat.com/errata/RHSA-2026:94278
Comment 22 Jon Orris 2026-11-04 16:01:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:95242 https://access.redhat.com/errata/RHSA-2026:95242
Comment 23 Jon Orris 2026-11-05 07:20:10 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-2026:95435 https://access.redhat.com/errata/RHSA-2026:95435
Comment 24 Jon Orris 2026-11-05 08:42:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:95477 https://access.redhat.com/errata/RHSA-2026:95477
Comment 25 Jon Orris 2026-11-05 08:54:53 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-2026:95478 https://access.redhat.com/errata/RHSA-2026:95478
Comment 26 Jon Orris 2026-11-06 04:11:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6 Extended Lifecycle Support  - EXTENSION

Via RHSA-2026:95727 https://access.redhat.com/errata/RHSA-2026:95727
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