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: 2026-09-17 08:51 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
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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.
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