{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-123601","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-11-06T01:00:16.506Z","datePublished":"2026-11-08T01:38:29.320Z","dateUpdated":"2026-11-10T17:57:10.157Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-11-08T01:38:29.320Z"},"datePublic":"2026-09-03T00:00:00.000Z","title":"Hickory DNS 0.26.0-beta.1 before 0.26.2 NSEC3 Proof of Nonexistence Forgery","descriptions":[{"lang":"en","value":"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 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."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Use of Incorrect Operator","cweId":"CWE-480","type":"CWE"}]}],"affected":[{"vendor":"hickory-dns","product":"hickory-dns","defaultStatus":"unaffected","packageURL":"pkg:cargo/hickory-net","versions":[{"version":"0.26.0-beta.1","status":"affected","versionType":"semver","lessThan":"0.26.2"},{"version":"0.26.2","status":"unaffected","versionType":"semver"}]},{"vendor":"hickory-dns","product":"hickory-dns","defaultStatus":"unaffected","packageURL":"pkg:cargo/hickory-proto","versions":[{"version":"0.25.0","status":"affected","versionType":"semver","lessThanOrEqual":"0.26.0-alpha.1"}]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.3,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS"},{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM"},"format":"CVSS"}],"references":[{"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-588m-chg6-8jqj","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-588m-chg6-8jqj)"},{"name":"VulnCheck Advisory: Hickory DNS 0.26.0-beta.1 before 0.26.2 NSEC3 Proof of Nonexistence Forgery","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/hickory-dns-0.26.0-beta.1-before-0.26.2-nsec3-proof-of-nonexistence-forgery"}],"credits":[{"lang":"en","value":"qifan-sailboat","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-11-10T15:42:05.282990Z","id":"CVE-2026-123601","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-11-10T17:57:10.157Z"}}]}}