What is CVE-2026-123580?

CVE-2026-123580 is a high-severity vulnerability in Hickory-Dns, classified under Authentication Bypass by Spoofing. CVSS score: 7.5/10. Published 2026-11-08.

How severe is CVE-2026-123580?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Hickory-Dns

CVE-2026-123580

Hickory DNS hickory-net 0.26.0-beta.1 before 0.26.2 and hickory-proto through 0.26.0-alpha.1 perform insufficient checks on NSEC3 record names during DNSSEC verification, comparing only the hashed label without confirming the record belongs to the correct zone. Attackers can supply NSEC3 records from another zone with a matching hash label to forge DNSSEC nonexistence proofs.

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (17.2th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Hickory-Dns

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

github.com/hickory-dns/hickory-dns/security/advisories/GHSA-p2jv-r3m3-7wf4 (vendor-advisory)
www.vulncheck.com/advisories/hickory-dns-0.26.0-beta.1-before-0.26.2-dnssec-non… (third-party-advisory)

Frequently asked questions

What is CVE-2026-123580?: CVE-2026-123580 is a high-severity vulnerability in Hickory-Dns, classified under Authentication Bypass by Spoofing. CVSS score: 7.5/10. Published 2026-11-08.
How severe is CVE-2026-123580?: High severity. CVSS v3 base score is 7.5 out of 10.