{"id":"UBUNTU-CVE-2026-12244","details":"If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an (uint16_t) variable that is used to allocate space needed for the RR wrap (because total size \u003e 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes","modified":"2026-06-29T13:56:27.095082049Z","published":"2026-06-25T00:00:00Z","related":["USN-8474-1"],"upstream":["CVE-2026-12244"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-12244"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8474-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-12244"}],"affected":[{"package":{"name":"nsd","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/nsd?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.1-1","4.12.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"nsd","binary_version":"4.12.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12244.json"}},{"package":{"name":"nsd","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.0-1ubuntu0.1~esm1"}]}],"versions":["4.12.0-1","4.13.0-6","4.14.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"nsd","binary_version":"4.14.0-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12244.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}