{"id":"UBUNTU-CVE-2026-41292","details":"NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).","modified":"2026-06-30T18:17:39.164892394Z","published":"2026-05-20T00:00:00Z","related":["USN-8282-1","USN-8282-2"],"upstream":["CVE-2026-41292"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-41292"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-41292"},{"type":"REPORT","url":"https://nlnetlabs.nl/news/2026/May/20/unbound-1.25.1-released/"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8282-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8282-2"}],"affected":[{"package":{"name":"unbound","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.7-1ubuntu2.6+esm4"}]}],"versions":["1.6.5-1","1.6.7-1","1.6.7-1build1","1.6.7-1ubuntu1","1.6.7-1ubuntu2","1.6.7-1ubuntu2.1","1.6.7-1ubuntu2.2","1.6.7-1ubuntu2.3","1.6.7-1ubuntu2.4","1.6.7-1ubuntu2.5","1.6.7-1ubuntu2.6","1.6.7-1ubuntu2.6+esm2","1.6.7-1ubuntu2.6+esm3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"libunbound2","binary_version":"1.6.7-1ubuntu2.6+esm4"},{"binary_name":"python-unbound","binary_version":"1.6.7-1ubuntu2.6+esm4"},{"binary_name":"python3-unbound","binary_version":"1.6.7-1ubuntu2.6+esm4"},{"binary_version":"1.6.7-1ubuntu2.6+esm4","binary_name":"unbound"},{"binary_name":"unbound-anchor","binary_version":"1.6.7-1ubuntu2.6+esm4"},{"binary_name":"unbound-host","binary_version":"1.6.7-1ubuntu2.6+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41292.json"}},{"package":{"name":"unbound","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.4-2ubuntu1.11+esm1"}]}],"versions":["1.9.0-2ubuntu1","1.9.0-2ubuntu2","1.9.4-2","1.9.4-2ubuntu1","1.9.4-2ubuntu1.1","1.9.4-2ubuntu1.2","1.9.4-2ubuntu1.3","1.9.4-2ubuntu1.4","1.9.4-2ubuntu1.5","1.9.4-2ubuntu1.6","1.9.4-2ubuntu1.8","1.9.4-2ubuntu1.9","1.9.4-2ubuntu1.11"],"ecosystem_specific":{"binaries":[{"binary_name":"libunbound8","binary_version":"1.9.4-2ubuntu1.11+esm1"},{"binary_name":"python-unbound","binary_version":"1.9.4-2ubuntu1.11+esm1"},{"binary_version":"1.9.4-2ubuntu1.11+esm1","binary_name":"python3-unbound"},{"binary_name":"unbound","binary_version":"1.9.4-2ubuntu1.11+esm1"},{"binary_name":"unbound-anchor","binary_version":"1.9.4-2ubuntu1.11+esm1"},{"binary_name":"unbound-host","binary_version":"1.9.4-2ubuntu1.11+esm1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41292.json"}},{"package":{"name":"unbound","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/unbound?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.1-1ubuntu5.15"}]}],"versions":["1.13.1-1ubuntu1","1.13.1-1ubuntu3","1.13.1-1ubuntu5","1.13.1-1ubuntu5.1","1.13.1-1ubuntu5.2","1.13.1-1ubuntu5.3","1.13.1-1ubuntu5.4","1.13.1-1ubuntu5.5","1.13.1-1ubuntu5.7","1.13.1-1ubuntu5.8","1.13.1-1ubuntu5.10","1.13.1-1ubuntu5.11","1.13.1-1ubuntu5.12","1.13.1-1ubuntu5.13","1.13.1-1ubuntu5.14"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.13.1-1ubuntu5.15","binary_name":"libunbound8"},{"binary_name":"python3-unbound","binary_version":"1.13.1-1ubuntu5.15"},{"binary_name":"unbound","binary_version":"1.13.1-1ubuntu5.15"},{"binary_name":"unbound-anchor","binary_version":"1.13.1-1ubuntu5.15"},{"binary_name":"unbound-host","binary_version":"1.13.1-1ubuntu5.15"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41292.json"}},{"package":{"name":"unbound","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/unbound?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.2-1ubuntu3.8"}]}],"versions":["1.17.1-2","1.18.0-2ubuntu1","1.18.0-2ubuntu2","1.19.1-1ubuntu1","1.19.2-1ubuntu1","1.19.2-1ubuntu3","1.19.2-1ubuntu3.1","1.19.2-1ubuntu3.2","1.19.2-1ubuntu3.3","1.19.2-1ubuntu3.4","1.19.2-1ubuntu3.5","1.19.2-1ubuntu3.6","1.19.2-1ubuntu3.7"],"ecosystem_specific":{"binaries":[{"binary_name":"libunbound8","binary_version":"1.19.2-1ubuntu3.8"},{"binary_name":"python3-unbound","binary_version":"1.19.2-1ubuntu3.8"},{"binary_name":"unbound","binary_version":"1.19.2-1ubuntu3.8"},{"binary_name":"unbound-anchor","binary_version":"1.19.2-1ubuntu3.8"},{"binary_name":"unbound-host","binary_version":"1.19.2-1ubuntu3.8"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41292.json"}},{"package":{"name":"unbound","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/unbound?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.22.0-2ubuntu2.3"}]}],"versions":["1.22.0-1ubuntu1","1.22.0-2ubuntu1","1.22.0-2ubuntu2","1.22.0-2ubuntu2.1","1.22.0-2ubuntu2.2"],"ecosystem_specific":{"binaries":[{"binary_name":"libunbound8","binary_version":"1.22.0-2ubuntu2.3"},{"binary_name":"python3-unbound","binary_version":"1.22.0-2ubuntu2.3"},{"binary_version":"1.22.0-2ubuntu2.3","binary_name":"unbound"},{"binary_name":"unbound-anchor","binary_version":"1.22.0-2ubuntu2.3"},{"binary_name":"unbound-host","binary_version":"1.22.0-2ubuntu2.3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41292.json"}},{"package":{"name":"unbound","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/unbound?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.24.2-1ubuntu2.1"}]}],"versions":["1.22.0-2ubuntu2","1.22.0-2ubuntu4","1.24.2-1ubuntu1","1.24.2-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"libunbound8","binary_version":"1.24.2-1ubuntu2.1"},{"binary_name":"python3-unbound","binary_version":"1.24.2-1ubuntu2.1"},{"binary_name":"unbound","binary_version":"1.24.2-1ubuntu2.1"},{"binary_name":"unbound-anchor","binary_version":"1.24.2-1ubuntu2.1"},{"binary_name":"unbound-host","binary_version":"1.24.2-1ubuntu2.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41292.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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:U/U:Red"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}