Bug 2568809 (CVE-2026-123588) - CVE-2026-123588 hickory-recursor: hickory-resolver: Hickory DNS: Denial of Service via cached empty connection pool
Summary: CVE-2026-123588 hickory-recursor: hickory-resolver: Hickory DNS: Denial of Se...
Keywords:
Status: NEW
Alias: CVE-2026-123588
Product: Security Response
Classification: Other
Component: vulnerability-draft
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-08 02:06 UTC by OSIDB Bzimport
Modified: 2026-11-08 03:22 UTC (History)
0 users

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Description OSIDB Bzimport 2026-11-08 02:06:17 UTC 
The recursive resolver in Hickory DNS (all versions of the hickory-recursor crate, and hickory-resolver 0.26.0 before 0.26.2) caches an empty connection pool when it follows a referral with no glue records and all queries for the name servers' IP addresses fail. An attacker able to spoof DNS responses can make these lookups fail, causing all subsequent queries for the affected zone to fail until the cache entry expires or is evicted.
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