Bug 2535461 (CVE-2026-81563) - CVE-2026-81563 bind: BIND resolver: Denial of Service due to resource exhaustion in SVCB/HTTPS AliasMode processing
Summary: CVE-2026-81563 bind: BIND resolver: Denial of Service due to resource exhaust...
Keywords:
Status: NEW
Alias: CVE-2026-81563
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2535876
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-16 14:26 UTC by OSIDB Bzimport
Modified: 2026-11-03 03:55 UTC (History)
17 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 RHSA-2026:75577 0 None None None 2026-10-05 05:34:24 UTC
Red Hat Product Errata RHSA-2026:75578 0 None None None 2026-10-05 08:05:57 UTC
Red Hat Product Errata RHSA-2026:94115 0 None None None 2026-11-03 01:22:12 UTC
Red Hat Product Errata RHSA-2026:94278 0 None None None 2026-11-03 03:55:15 UTC

Description OSIDB Bzimport 2026-09-16 14:26:10 UTC 
A BIND resolver encountering an SVCB/HTTPS AliasMode record referencing 14 or more SVCB/HTTPS ServiceMode records may fail to properly deallocate internal resources. If this happens repeatedly, resource exhaustion will eventually prevent the resolver from performing new recursive lookups.
This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Comment 3 Jon Orris 2026-10-05 05:34:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:75577 https://access.redhat.com/errata/RHSA-2026:75577
Comment 4 Jon Orris 2026-10-05 08:05:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:75578 https://access.redhat.com/errata/RHSA-2026:75578
Comment 7 Jon Orris 2026-11-03 01:22:10 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 8 Jon Orris 2026-11-03 03:55:14 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
Note You need to log in before you can comment on or make changes to this bug.