Vulnerability Description
Hickory DNS hickory-proto 0.25 through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 contain a DNSSEC validation flaw in the validating recursor's NSEC3 handler, which matches the closest encloser by hash alone without checking the type bitmap and so accepts parent-side ancestor-delegation NSEC3 records as proof of nonexistence. An attacker who delivers one response built from genuinely signed parent NSEC3 records can cause NXDOMAIN or NODATA to be cached with AD=1, denying resolution of existing names at and below the zone cut.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-624w-vvww-xv
- https://www.vulncheck.com/advisories/hickory-dns-through-0.26.0-alpha.1-dnssec-v
FAQ
What is CVE-2026-123595?
CVE-2026-123595 is a vulnerability with a CVSS score of 8.8 (HIGH). Hickory DNS hickory-proto 0.25 through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 contain a DNSSEC validation flaw in the validating recursor's NSEC3 handler, which matches the closest...
How severe is CVE-2026-123595?
CVE-2026-123595 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-123595?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.