Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-3jvh-8vj5-65
- https://www.vulncheck.com/advisories/hickory-dns-hickory-proto-0.25.0-alpha.3-th
FAQ
What is CVE-2026-123600?
CVE-2026-123600 is a vulnerability with a CVSS score of 4.8 (MEDIUM). 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 ...
How severe is CVE-2026-123600?
CVE-2026-123600 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-123600?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.