{"id":"UBUNTU-CVE-2026-123602","details":"The Hickory DNS recursor in all versions of hickory-recursor and in hickory-resolver 0.26.0-beta.1 before 0.26.2 (recursor feature) is vulnerable to ghost domain names attacks because it reuses child-side apex NS RRsets cached from zone NS queries for iterative resolution. By repeatedly querying a zone's NS records, an attacker keeps the stale RRset cached indefinitely, letting name servers whose delegation the parent revoked keep answering for the zone.","modified":"2026-11-10T02:50:13.274744362Z","published":"2026-11-09T00:00:00Z","upstream":["CVE-2026-123602"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-123602"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-123602"},{"type":"REPORT","url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-2hxp-x833-73f7"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/hickory-dns-recursor-ghost-domain-attack-via-child-side-ns-rrset-caching"}],"affected":[{"package":{"name":"rust-hickory-resolver","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/rust-hickory-resolver?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.24.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-hickory-resolver-dev","binary_version":"0.24.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123602.json"}},{"package":{"name":"rust-hickory-recursor","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/rust-hickory-recursor?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.24.1-1","0.25.2-6"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-hickory-recursor-dev","binary_version":"0.25.2-6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123602.json"}},{"package":{"name":"rust-hickory-resolver","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/rust-hickory-resolver?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.24.4-5","0.26.1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.26.1-1","binary_name":"librust-hickory-resolver-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123602.json"}},{"package":{"name":"rust-hickory-recursor","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/rust-hickory-recursor?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.24.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-hickory-recursor-dev","binary_version":"0.24.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123602.json"}},{"package":{"name":"rust-hickory-resolver","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/rust-hickory-resolver?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.24.4-1","0.24.4-5"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-hickory-resolver-dev","binary_version":"0.24.4-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123602.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}