MajorCritical vulnerability

CVE-2026-123591 (CVSS 8.2)

NVD · officialPublished Nov 8, 2026Risk 37/100EPSS 0.1%

Hickory DNS hickory-net 0.26.0-beta.1 before 0.26.2 and hickory-proto through 0.26.0-alpha.1 fail to verify, per RFC 6840 §4.4, that an NSEC or NSEC3 record denying a DS RRset also proves the delegation's NS record exists. Attackers can reuse child-side NSEC or NSEC3 records to fake an insecure delegation and forge child-zone records.

Technical details

CVSS

8.2

AV:NetworkAC:HighPR:NoneUI:None

Evidence and sources

This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.

Open primary source