{"id":"CVE-2026-123601","title":"Hickory DNS 0.26.0-beta.1 before 0.26.2 NSEC3 Proof of Nonexistence Forgery","summary":"Hickory DNS hickory-proto 0.25.0 through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 invert the relational operators in the wrap-around branch of find_covering_record() in nsec3.rs, so the last NSEC3 record in a zone's has…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","cvssSource":"cna","cwe":["CWE-480"],"vendor":"hickory-dns","product":"hickory-dns","affected":["hickory-dns >= 0.26.0-beta.1 < 0.26.2","hickory-dns >= 0.25.0 <= 0.26.0-alpha.1"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:38:29.320Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123601","references":[{"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-588m-chg6-8jqj","label":"GitHub Security Advisory (GHSA-588m-chg6-8jqj)"},{"url":"https://www.vulncheck.com/advisories/hickory-dns-0.26.0-beta.1-before-0.26.2-nsec3-proof-of-nonexistence-forgery","label":"VulnCheck Advisory: Hickory DNS 0.26.0-beta.1 before 0.26.2 NSEC3 Proof of Nonexistence Forgery"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.647Z","slug":"CVE-2026-123601","body":"## Overview\n\nHickory DNS hickory-proto 0.25.0 through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 invert the relational operators in the wrap-around branch of find_covering_record() in nsec3.rs, so the last NSEC3 record in a zone's hash ring covers every hash except its owner. Attackers able to inject DNS responses can replay that NSEC3 record and its RRSIG to forge DNSSEC-validated negative responses denying legitimate names.\n\n## Affected\n\n- `hickory-dns >= 0.26.0-beta.1 < 0.26.2`\n- `hickory-dns >= 0.25.0 <= 0.26.0-alpha.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}