{"affected":[{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"hickory-proto","product":"hickory-dns","source":"CNA: VulnCheck","vendor":"hickory-dns","versions":[{"lessThan":"0.26.2","status":"affected","version":"0.18","versionType":"custom"},{"status":"unaffected","version":"0.26.2","versionType":"semver"}]}],"cveId":"CVE-2026-123570","cwes":["CWE-400"],"description":"The DNS wire-format message parser in hickory-proto (Hickory DNS) 0.18 before 0.26.2 preallocates record vectors sized by the untrusted ANCOUNT, NSCOUNT, and ARCOUNT header fields before reading record data. Remote attackers can send a UDP datagram, or a spoofed response to a client/resolver, with these counts set to 65535, forcing about 18MB of allocation per message.","epss":{"date":"2026-11-08","percentile":0.35482,"score":0.00409},"exploits":[],"kev":null,"metrics":[{"score":8.7,"severity":"high","source":"CNA: 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","version":"4.0"},{"score":7.5,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},{"score":8.7,"severity":"high","source":"NVD: disclosure@vulncheck.com","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","version":"4.0"},{"score":7.5,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794232557344,"publishedAt":1794101887919,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-67wc-6jq8-ghrc"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/hickory-dns-from-0.18-before-0.26.2-memory-amplification-dos-via-rr-counts"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-67wc-6jq8-ghrc"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/hickory-dns-from-0.18-before-0.26.2-memory-amplification-dos-via-rr-counts"}],"remediation":[],"revision":"f6cbfaa365150a8d1732127852971f979b5cef126bc40d7a1803d66e9d559c9b","sources":[{"modifiedAt":1794232557344,"name":"CNA: VulnCheck","retrievedAt":1794233357163,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123570"},{"modifiedAt":1794104209830,"name":"NVD","retrievedAt":1794118576718,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123570"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794233397388,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-123570"}],"ssvc":{"assessedAt":1794232549382,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts","updatedAt":1794233397388}