{"id":"CVE-2026-123607","title":"Hickory DNS NSEC3 Closest-Encloser Proof Unbounded Loop Denial of Service","summary":"Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 and hickory-net before 0.26.1 contain an unbounded loop vulnerability in DnssecDnsHandle NSEC3 closest-encloser proof validation when the SOA owner is not an ancestor of the QNAME. …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-835"],"vendor":"hickory-dns","product":"hickory-dns","affected":["hickory-dns >= 0.25.0-alpha.3 <= 0.25.2","hickory-dns >= 0.26.0-alpha.1 < 0.26.1"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:38:33.416Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123607","references":[{"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-3v94-mw7p-v465","label":"GitHub Security Advisory (GHSA-3v94-mw7p-v465)"},{"url":"https://www.vulncheck.com/advisories/hickory-dns-nsec3-closest-encloser-proof-unbounded-loop-denial-of-service","label":"VulnCheck Advisory: Hickory DNS NSEC3 Closest-Encloser Proof Unbounded Loop Denial of Service"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.640Z","slug":"CVE-2026-123607","body":"## Overview\n\nHickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 and hickory-net before 0.26.1 contain an unbounded loop vulnerability in DnssecDnsHandle NSEC3 closest-encloser proof validation when the SOA owner is not an ancestor of the QNAME. Upstream attackers can return NoData or NXDomain responses with a cross-zone SOA record to panic debug builds or exhaust memory in release builds.\n\n## Affected\n\n- `hickory-dns >= 0.25.0-alpha.3 <= 0.25.2`\n- `hickory-dns >= 0.26.0-alpha.1 < 0.26.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}