What is CVE-2026-123607?

CVE-2026-123607 is a high-severity vulnerability in Hickory-Dns, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-11-08.

How severe is CVE-2026-123607?

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

Vulnerability in Hickory-Dns

CVE-2026-123607

Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 and hickory-net before 0.26.1 contain an unbounded loop vulnerability in DnssecDnsHandle NSEC3 closest-encloser proof validation when the SOA owner is not an ancestor of the QNAME. Upstream attackers can return NoData or NXDomain responses with a cross-zone SOA record to panic debug builds or exhaust memory in release builds.

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:N/A:H.

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-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

GitHub Security Advisory (GHSA-3v94-mw7p-v465) (vendor-advisory)
VulnCheck Advisory: Hickory DNS NSEC3 Closest-Encloser Proof Unbounded Loop Denial of Service (third-party-advisory)

Frequently asked questions

What is CVE-2026-123607?: CVE-2026-123607 is a high-severity vulnerability in Hickory-Dns, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-11-08.
How severe is CVE-2026-123607?: High severity. CVSS v3 base score is 7.5 out of 10.