{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-123594","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-11-06T00:57:31.045Z","datePublished":"2026-11-08T01:38:24.397Z","dateUpdated":"2026-11-09T13:51:34.546Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-11-08T01:38:24.397Z"},"datePublic":"2026-09-03T00:00:00.000Z","title":"Hickory DNS through 0.26.0-alpha.1 DNSSEC NSEC Validation Bypass for Empty Non-Terminals","descriptions":[{"lang":"en","value":"Hickory DNS hickory-proto through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 contain an NSEC validation flaw that returns a secure proof for NXDOMAIN responses when the covering NSEC's Next Domain Name is a strict descendant of the query name, which actually proves the name exists as an empty non-terminal. On-path attackers can flip the unsigned rcode of a genuine signed NODATA response from NOERROR to NXDOMAIN, causing validators to accept forged nonexistence of the name."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Insufficient Verification of Data Authenticity","cweId":"CWE-345","type":"CWE"}]}],"affected":[{"vendor":"hickory-dns","product":"hickory-dns","defaultStatus":"unaffected","packageURL":"pkg:cargo/hickory-proto","versions":[{"version":"0","status":"affected","versionType":"semver","lessThanOrEqual":"0.26.0-alpha.1"}]},{"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"}]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","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:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","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:L","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"LOW","baseScore":4.8,"baseSeverity":"MEDIUM"},"format":"CVSS"}],"references":[{"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-86vr-jm6c-7cpg","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-86vr-jm6c-7cpg)"},{"name":"VulnCheck Advisory: Hickory DNS through 0.26.0-alpha.1 DNSSEC NSEC Validation Bypass for Empty Non-Terminals","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/hickory-dns-through-0.26.0-alpha.1-dnssec-nsec-validation-bypass-for-empty-non-terminals"}],"credits":[{"lang":"en","value":"qifan-sailboat","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-11-09T13:51:26.201045Z","id":"CVE-2026-123594","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":"2026-11-09T13:51:34.546Z"}}]}}