What is CVE-2026-123585?

CVE-2026-123585 is a medium-severity vulnerability in Hickory-Dns, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-11-08.

How severe is CVE-2026-123585?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Hickory-Dns

CVE-2026-123585

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.

Vulnerability class: DoS (Denial of Service)

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Hickory-Dns

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

GitHub Security Advisory (GHSA-6f2x-v7q7-m7m5) (vendor-advisory)
VulnCheck Advisory: Hickory DNS 0.25.0 before 0.26.2 Query Amplification via Irrelevant CNAME Records (third-party-advisory)

Frequently asked questions

What is CVE-2026-123585?: CVE-2026-123585 is a medium-severity vulnerability in Hickory-Dns, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-11-08.
How severe is CVE-2026-123585?: Medium severity. CVSS v3 base score is 5.3 out of 10.