{"id":"UBUNTU-CVE-2026-66374","details":"Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.","modified":"2026-07-29T08:01:44Z","published":"2026-07-25T01:16:00Z","upstream":["CVE-2026-66374"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-66374"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-66374"},{"type":"REPORT","url":"https://openwall.com/lists/oss-security/2026/07/23/6"},{"type":"REPORT","url":"https://github.com/venglin/knot-doq"}],"affected":[{"package":{"name":"knot-resolver","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/knot-resolver?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.0~beta2-123-g6134920-1","1.0.0~beta3-1","1.0.0~beta3-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"knot-resolver","binary_version":"1.0.0~beta3-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66374.json"}},{"package":{"name":"knot-resolver","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/knot-resolver?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.3-1","1.5.0-4","1.5.1-1","1.5.2-1","2.0.0-3","2.1.0-1","2.1.0-2","2.1.1-1","2.1.1-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.1.1-1ubuntu0.1~esm2","binary_name":"knot-resolver"},{"binary_name":"knot-resolver-module-http","binary_version":"2.1.1-1ubuntu0.1~esm2"},{"binary_name":"libkres6","binary_version":"2.1.1-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66374.json"}},{"package":{"name":"knot-resolver","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/knot-resolver?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.1-3","3.2.1-3ubuntu1","3.2.1-3ubuntu2","3.2.1-3ubuntu2.1","3.2.1-3ubuntu2.2"],"ecosystem_specific":{"binaries":[{"binary_name":"knot-resolver","binary_version":"3.2.1-3ubuntu2.2"},{"binary_name":"knot-resolver-module-http","binary_version":"3.2.1-3ubuntu2.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66374.json"}},{"package":{"name":"knot-resolver","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/knot-resolver?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.1-1","5.4.2-1","5.4.3-1","5.4.4-1","5.4.4-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.4.4-1ubuntu0.1~esm1","binary_name":"knot-resolver"},{"binary_version":"5.4.4-1ubuntu0.1~esm1","binary_name":"knot-resolver-module-http"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66374.json"}},{"package":{"name":"knot-resolver","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/knot-resolver?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.6.0-1.1","5.7.0-1build1","5.7.1-1","5.7.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"knot-resolver","binary_version":"5.7.2-1"},{"binary_name":"knot-resolver-module-http","binary_version":"5.7.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66374.json"}},{"package":{"name":"knot-resolver","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/knot-resolver?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.7.5-1","6.0.15-4build1","6.0.17-1","6.2.0-2"],"ecosystem_specific":{"binaries":[{"binary_version":"6.2.0-2","binary_name":"knot-resolver6"},{"binary_version":"6.2.0-2","binary_name":"knot-resolver6-module-dnstap"},{"binary_name":"knot-resolver6-module-http","binary_version":"6.2.0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66374.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L"},{"type":"Ubuntu","score":"medium"}]}