What is CVE-2026-123599?

CVE-2026-123599 is a low-severity vulnerability in Hickory-Dns, classified under Insufficient Verification of Data Authenticity. CVSS score: 3.7/10. Published 2026-11-08.

How severe is CVE-2026-123599?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Hickory-Dns

CVE-2026-123599

Hickory DNS hickory-proto before 0.26.0-beta.1 and hickory-net before 0.26.2 contain a DNSSEC validation bypass because verify_rrsets() ignores DNS class when partitioning RRsets, so non-IN records skip signature verification yet are marked secure when the IN records verify. Attackers able to supply DNS responses can include forged CH or HS class records, including DS records, to authenticate any DNSKEY and forge child zone responses.

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

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-345 — Insufficient Verification of Data Authenticity

References

github.com/hickory-dns/hickory-dns/security/advisories/GHSA-wjgj-fvg9-65w9 (vendor-advisory)
www.vulncheck.com/advisories/hickory-dns-before-0.26.0-beta.1-dnssec-validation… (third-party-advisory)

Frequently asked questions

What is CVE-2026-123599?: CVE-2026-123599 is a low-severity vulnerability in Hickory-Dns, classified under Insufficient Verification of Data Authenticity. CVSS score: 3.7/10. Published 2026-11-08.
How severe is CVE-2026-123599?: Low severity. CVSS v3 base score is 3.7 out of 10.