Vulnerability in Hickory-Dns
CVE-2026-123601
Hickory DNS hickory-proto 0.25.0 through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 invert the relational operators in the wrap-around branch of find_covering_record() in nsec3.rs, so the last NSEC3 record in a zone's hash ring covers every hash except its owner. Attackers able to inject DNS responses can replay that NSEC3 record and its RRSIG to forge DNSSEC-validated negative responses denying legitimate names.
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-588m-chg6-8jqj) (vendor-advisory)
- VulnCheck Advisory: Hickory DNS 0.26.0-beta.1 before 0.26.2 NSEC3 Proof of Nonexistence Forgery (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123601?
- CVE-2026-123601 is a medium-severity vulnerability in Hickory-Dns, classified under CWE-480. CVSS score: 6.5/10. Published 2026-11-08.
- How severe is CVE-2026-123601?
- Medium severity. CVSS v3 base score is 6.5 out of 10.