{"id":"UBUNTU-CVE-2026-6507","details":"A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the `--dhcp-split-relay` option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS).","modified":"2026-05-26T20:00:13.783860459Z","published":"2026-04-17T13:16:00Z","related":["USN-8308-1"],"upstream":["CVE-2026-6507"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-6507"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-6507"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2459181"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8308-1"}],"affected":[{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.92-1ubuntu0.3"}]}],"versions":["2.91-1build1","2.92~rc3-1","2.92-1","2.92-1ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_name":"dnsmasq","binary_version":"2.92-1ubuntu0.3"},{"binary_name":"dnsmasq-base","binary_version":"2.92-1ubuntu0.3"},{"binary_name":"dnsmasq-base-lua","binary_version":"2.92-1ubuntu0.3"},{"binary_name":"dnsmasq-utils","binary_version":"2.92-1ubuntu0.3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6507.json"}}],"schema_version":"1.7.5","severity":[{"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"}]}