{"id":"CVE-2026-93007","aliases":["AZL-112418","DEBIAN-CVE-2026-93007","EUVD-2026-112790","GHSA-2frf-fr59-fcjq","UBUNTU-CVE-2026-93007","openSUSE-SU-2026:12415-1"],"status":"published","title":"Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation","description":"A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00427,"percentile":0.37188,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2026-10-29T12:47:18Z","modified":"2026-11-06T02:17:59Z","affected":[{"source":"osv","ecosystem":"Azure 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hat","product":"red hat ceph storage 9"},{"vendor":"red hat","product":"red hat enterprise linux 10"},{"vendor":"red hat","product":"red hat enterprise linux 6"},{"vendor":"red hat","product":"red hat enterprise linux 7"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"},{"vendor":"red hat","product":"red hat openshift container platform 4"},{"vendor":"red hat","product":"red hat openshift container platform 5"},{"vendor":"red hat","product":"red hat openstack platform 13 (queens)"},{"vendor":"red hat","product":"red hat openstack platform 18.0"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-93007","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536076","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93007","tags":["web"]},{"url":"https://github.com/advisories/GHSA-2frf-fr59-fcjq"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-93007","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-93007","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93007","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93006","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93007","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93008","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93009","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93011","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-93007","title":"Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation","description":"A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.","status":"published","published":"2026-10-29T12:47:18.954Z","modified":"2026-11-06T01:50:35.341Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-06T02:55:55.947181Z"}],"euvd":[{"id":"EUVD-2026-112790","description":"A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.","status":"published","published":"2026-10-29T12:47:18Z","modified":"2026-11-06T01:50:35Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-06T03:02:58.554056Z"}],"ghsa":[{"id":"GHSA-2frf-fr59-fcjq","title":"A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and...","description":"A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.","status":"published","published":"2026-10-29T15:30:51Z","modified":"2026-10-29T15:30:52Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:14:38.729227Z"}],"nvd":[{"id":"CVE-2026-93007","description":"A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.","status":"published","published":"2026-10-29T13:17:15.89Z","modified":"2026-11-06T02:17:59.44Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-400"],"updated_at":"2026-11-06T06:59:07.128224Z"}],"osv":[{"id":"DEBIAN-CVE-2026-93007","description":"A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.","status":"published","published":"2026-10-29T13:17:15.89Z","modified":"2026-10-31T09:47:35.366852475Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:46:06.846102Z"},{"id":"UBUNTU-CVE-2026-93007","description":"A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.","status":"published","published":"2026-10-29T13:17:00Z","modified":"2026-11-05T04:38:27Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-05T13:33:42.748455Z"},{"id":"AZL-112418","title":"CVE-2026-93007 affecting package dnsmasq 2.93-1","description":"A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.","status":"published","published":"2026-10-29T13:17:15Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:19.001909Z"},{"id":"openSUSE-SU-2026:12415-1","title":"dnsmasq-2.93-3.1 on GA media","description":"These are all security issues fixed in the dnsmasq-2.93-3.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-11-04T00:00:00Z","modified":"2026-11-05T17:23:17.426007732Z","updated_at":"2026-11-05T17:55:05.69587Z"}]}}