{"id":"CVE-2026-123600","title":"Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 NSEC3 Apex NODATA Validation Bypass","summary":"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 a…","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L","cvssSource":"cna","cwe":["CWE-358"],"vendor":"hickory-dns","product":"hickory-dns","affected":["hickory-dns >= 0.25.0-alpha.3 <= 0.25.2","hickory-dns >= 0.26.0-alpha.1 < 0.26.2"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:38:28.487Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123600","references":[{"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-3jvh-8vj5-65rq","label":"GitHub Security Advisory (GHSA-3jvh-8vj5-65rq)"},{"url":"https://www.vulncheck.com/advisories/hickory-dns-hickory-proto-0.25.0-alpha.3-through-0.25.2-nsec3-apex-nodata-validation-bypass","label":"VulnCheck Advisory: Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 NSEC3 Apex NODATA Validation Bypass"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.642Z","slug":"CVE-2026-123600","body":"## Overview\n\nHickory 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.\n\n## Affected\n\n- `hickory-dns >= 0.25.0-alpha.3 <= 0.25.2`\n- `hickory-dns >= 0.26.0-alpha.1 < 0.26.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":26.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}