Bug 2568724 (CVE-2026-123585) - CVE-2026-123585 hickory-resolver: hickory-resolver: Denial of Service via DNS query amplification from irrelevant CNAME records
Summary: CVE-2026-123585 hickory-resolver: hickory-resolver: Denial of Service via DNS...
Keywords:
Status: NEW
Alias: CVE-2026-123585
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-08 02:01 UTC by OSIDB Bzimport
Modified: 2026-11-08 02:20 UTC (History)
15 users (show)

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-11-08 02:01:55 UTC 
The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses can include CNAME records in the authority or additional sections, or outside the original query name's CNAME chain, causing excess resolver queries and increased query amplification.
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