CVE-2026-123585

MEDIUM 5.3

Hickory DNS 0.25.0 before 0.26.2 Query Amplification via Irrelevant CNAME Records

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-400
Vendor	hickory-dns
Product	hickory-dns
Published	Nov 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

hickory-dns / hickory-dns

0.25.0 < 0.26.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-6f2x-v7q7-m7m5 vulncheck.com: https://www.vulncheck.com/advisories/hickory-dns-0.25.0-before-0.26.2-query-amplification-via-irrelevant-cname-records

Credits

🔍 qifan-sailboat