Bug 2535877 - CVE-2026-81736 bind: BIND 9: Remote Denial of Service via cached SVCB/HTTPS AliasMode records [fedora-all]
Summary: CVE-2026-81736 bind: BIND 9: Remote Denial of Service via cached SVCB/HTTPS A...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: bind
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Petr Menšík
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["27f74bcd-5f9f-427b-b83f-8...
Depends On:
Blocks: CVE-2026-81736
TreeView+ depends on / blocked
 
Reported: 2026-09-17 08:52 UTC by Vladimir Vasilev
Modified: 2026-09-17 08:52 UTC (History)
5 users (show)

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

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Description Vladimir Vasilev 2026-09-17 08:52:03 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.
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