{"id":"UBUNTU-CVE-2026-123598","details":"The validating recursor in Hickory DNS hickory-recursor 0.25.0 through 0.26.0-alpha.1, hickory-resolver 0.26.0-alpha.1 before 0.26.2, and hickory-net 0.26.0-beta.1 before 0.26.2 caches DNSSEC-bogus answers using the untrusted, attacker-supplied record TTL (capped at 24 hours) instead of a short validation-failure TTL. A remote attacker who spoofs a single authoritative response with an invalid signature and a long TTL can keep the bogus result cached for up to 24 hours.","modified":"2026-11-10T02:50:13.586153423Z","published":"2026-11-09T00:00:00Z","upstream":["CVE-2026-123598"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-123598"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-123598"},{"type":"REPORT","url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-29q9-p769-j8gq"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/hickory-dns-0.25.0-through-0.26.0-alpha.1-dnssec-bogus-answer-cache-poisoning"}],"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-2026-123598.json"}},{"package":{"name":"rust-hickory-net","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/rust-hickory-net?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.26.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-hickory-net-dev","binary_version":"0.26.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123598.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-2026-123598.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_name":"librust-hickory-resolver-dev","binary_version":"0.26.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123598.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_version":"0.24.1-1","binary_name":"librust-hickory-recursor-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123598.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-2026-123598.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:N/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}