What is CVE-2026-123598?

CVE-2026-123598 is a low-severity vulnerability in Hickory-Dns, classified under Insufficient Session Expiration. CVSS score: 3.7/10. Published 2026-11-08.

How severe is CVE-2026-123598?

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

Vulnerability in Hickory-Dns

CVE-2026-123598

The validating recursor in Hickory DNS hickory-recursor 0.25.0 through 0.26.0-alpha.1, hickory-resolver 0.26.0-alpha.1 before 0.26.2, and hickory-net 0.26.0-beta.1 before 0.26.2 caches DNSSEC-bogus answers using the untrusted, attacker-supplied record TTL (capped at 24 hours) instead of a short validation-failure TTL. A remote attacker who spoofs a single authoritative response with an invalid signature and a long TTL can keep the bogus result cached for up to 24 hours.

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: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-613 — Insufficient Session Expiration

References

GitHub Security Advisory (GHSA-29q9-p769-j8gq) (vendor-advisory)
VulnCheck Advisory: Hickory DNS 0.25.0 through 0.26.0-alpha.1 DNSSEC Bogus Answer Cache Poisoning (third-party-advisory)

Frequently asked questions

What is CVE-2026-123598?: CVE-2026-123598 is a low-severity vulnerability in Hickory-Dns, classified under Insufficient Session Expiration. CVSS score: 3.7/10. Published 2026-11-08.
How severe is CVE-2026-123598?: Low severity. CVSS v3 base score is 3.7 out of 10.