Bug 2535432 (CVE-2026-81736) - CVE-2026-81736 bind: BIND 9: Remote Denial of Service via cached SVCB/HTTPS AliasMode records
Summary: CVE-2026-81736 bind: BIND 9: Remote Denial of Service via cached SVCB/HTTPS A...
Keywords:
Status: NEW
Alias: CVE-2026-81736
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: 2535877
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-16 13:58 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 05:34:20 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 01:22:08 UTC
Red Hat Product Errata RHSA-2026:94278 0 None None None 2026-11-03 03:55:11 UTC

Description OSIDB Bzimport 2026-09-16 13:58:55 UTC 
If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPU time constructing the response.
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 05:34:19 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 8 Jon Orris 2026-11-03 01:22:06 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 9 Jon Orris 2026-11-03 03:55:09 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
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