{"id":"CVE-2026-123574","aliases":["RUSTSEC-2026-0490","GHSA-4rph-pmrw-mwpw"],"title":"Hickory DNS 0.24.0 before 0.26.2 Denial of Service via Zone File Parser","titleSource":"VulnCheck","descriptionSource":"OSV","description":"The zone file lexer read each token in a loop capped at 4,096 iterations, with an `assert!` on the loop counter as a safety bound. A single token long enough to reach that bound, for example a very long name or character string in a zone file, triggered the assertion and the parser panicked instead of returning the token or an error.\n\nCode that parses zone files from an untrusted source can be made to panic, which is a denial of service.\n\nThe fix removes the iteration bound, so the lexer ends only when it reaches the end of a token or an error. It is in 0.26.2.","severity":"high","score":8.7,"published":"2026-09-03T12:00:00.000Z","modified":"2026-11-12T09:31:57.000Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"crates.io","name":"hickory-proto","sources":[{"name":"OSV · RUSTSEC-2026-0490","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0490"}],"ranges":[{"events":[{"introduced":"0.24.0"},{"fixed":"0.26.2"}],"type":"SEMVER"}],"versions":[],"fixed":["0.26.2"]}],"sourceAffected":[],"references":["https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-4rph-pmrw-mwpw","https://www.vulncheck.com/advisories/hickory-dns-0.24.0-before-0.26.2-denial-of-service-via-zone-file-parser","https://crates.io/crates/hickory-proto","https://rustsec.org/advisories/RUSTSEC-2026-0490.html","https://github.com/hickory-dns/hickory-dns/commit/0494e15c88fba612f9ecb4f013eb3b221822c867"],"sources":[{"name":"CVE","id":"CVE-2026-123574","modified":"2026-11-09T14:31:12.367Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-123574"},{"name":"OSV","id":"RUSTSEC-2026-0490","modified":"2026-11-12T09:31:57Z","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0490"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5}],"cve":{"records":[{"id":"CVE-2026-123574","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-11-06T00:53:14.313Z","published":"2026-11-08T01:38:10.613Z","modified":"2026-11-09T14:31:12.367Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-11-08T01:38:10.613Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-11-09T14:31:12.367Z"}],"references":[{"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-4rph-pmrw-mwpw","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/hickory-dns-0.24.0-before-0.26.2-denial-of-service-via-zone-file-parser","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-20","description":"Improper Input Validation","source":"VulnCheck"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-11-09T14:31:04.093353Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"products":[{"vendor":"hickory-dns","name":"hickory-dns","platforms":[],"versions":[{"version":"0.24.0","status":"affected","lessThan":"0.26.2","versionType":"semver"},{"version":"0.26.2","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:cargo/hickory-proto","packageIdentity":{"ecosystem":"crates.io","name":"hickory-proto"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-123574"}],"remediation":[],"observedAt":"2026-11-12T13:14:29.172Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T01:45:32.170Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-08T02:40:33.235Z","attemptedAt":"2026-11-08T02:40:33.235Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-11-08T02:40:33.062Z","attemptedAt":"2026-11-08T02:40:33.062Z"},{"source":"EUVD","status":"no-result","checkedAt":"2026-11-08T02:40:32.691Z","attemptedAt":"2026-11-08T02:40:32.691Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-11-08T02:40:32.497Z","attemptedAt":"2026-11-08T02:40:32.497Z"}],"evidence":[{"source":"NVD","id":"CVE-2026-123574","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123574","modified":"2026-11-08T02:16:50.450","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-11-08T02:40:33.235Z"},{"source":"NVD","id":"CVE-2026-123574","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123574","modified":"2026-11-08T02:16:50.450","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-08T02:40:33.235Z"}],"aiSummary":{"text":"Hickory DNS versions before 0.26.2 have a denial of service vulnerability via the zone file parser, which can panic when parsing a long token from an untrusted source. The weakness is due to improper input validation. Affected versions include 0.24.0.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-11T13:26:07.011Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-123574"},{"name":"OSV","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0490"}]}}