What is CVE-2026-123600?

CVE-2026-123600 is a medium-severity vulnerability in Hickory-Dns, classified under CWE-358. CVSS score: 4.8/10. Published 2026-11-08.

How severe is CVE-2026-123600?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Hickory-Dns

CVE-2026-123600

Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 and hickory-net 0.26.0-alpha.1 before 0.26.2 contain a DNSSEC validation flaw in DnssecDnsHandle that accepts NSEC3-signed NODATA responses for zone-apex queries as secure without an NSEC3 record matching the hashed QNAME. On-path attackers or malicious authoritative servers can replay a validly signed non-apex NSEC3 with the zone's signed SOA to serve an authenticated (AD=1) denial of any apex RRtype for the negative-cache TTL.

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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-358

References

GitHub Security Advisory (GHSA-3jvh-8vj5-65rq) (vendor-advisory)
VulnCheck Advisory: Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 NSEC3 Apex NODATA Validation Bypass (third-party-advisory)

Frequently asked questions

What is CVE-2026-123600?: CVE-2026-123600 is a medium-severity vulnerability in Hickory-Dns, classified under CWE-358. CVSS score: 4.8/10. Published 2026-11-08.
How severe is CVE-2026-123600?: Medium severity. CVSS v3 base score is 4.8 out of 10.