Bug 2568759 (CVE-2026-123606) - CVE-2026-123606 hickory-recursor: hickory-resolver: hickory-dns: Denial of Service via glueless referral amplification
Summary: CVE-2026-123606 hickory-recursor: hickory-resolver: hickory-dns: Denial of Se...
Keywords:
Status: NEW
Alias: CVE-2026-123606
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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Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-08 02:01 UTC by OSIDB Bzimport
Modified: 2026-11-08 02:32 UTC (History)
0 users

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Description OSIDB Bzimport 2026-11-08 02:01:58 UTC 
The hickory-dns recursor in hickory-recursor 0.25.0-alpha.3 through 0.25.2 and hickory-resolver 0.26.0-alpha.1 before 0.26.2 iterates every out-of-bailiwick NS target lacking glue in a referral without any per-query work budget. Remote attackers can serve such referrals to force A and AAAA lookups per target, amplifying traffic against remote servers or exhausting recursor resources.
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