{"id":"CVE-2026-4890","title":"A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.","summary":"A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-835"],"published":"2026-05-11","updated":"2026-07-02","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-4890","references":[{"url":"https://github.com/NixOS/nixpkgs/pull/519082","label":"cret@cert.org"},{"url":"https://github.com/NixOS/nixpkgs/pull/519093","label":"cret@cert.org"},{"url":"https://github.com/pi-hole/FTL/releases/tag/v6.6.2","label":"cret@cert.org"},{"url":"https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html","label":"cret@cert.org"},{"url":"https://thekelleys.org.uk/dnsmasq/CVE/","label":"cret@cert.org"},{"url":"https://www.kb.cert.org/vuls/id/471747","label":"cret@cert.org"},{"url":"https://access.redhat.com/errata/RHSA-2026:19158","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19373","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:20589","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:34508","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-4890","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458516","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4890.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-4890"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4890"},{"url":"https://access.redhat.com/errata/RHSA-2026:40762"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.08849,"epssPercentile":0.95175,"ingestedAt":"2026-07-02T13:35:59.386Z","vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 10)","affected":["enterprise_linux 6","enterprise_linux 7","openshift_container_platform 4","openshift_container_platform 4.19","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_8","enterprise_linux_appstream_eus_v_9_6","enterprise_linux_appstream_v_9"],"patched":["openshift_container_platform 4.19","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_8","enterprise_linux_appstream_eus_v_9_6","enterprise_linux_appstream_v_9"],"slug":"CVE-2026-4890","body":"## Overview\n\nA Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:40762** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-07-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:40762)\n- **RHSA-2026:19158** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:19158)\n- **RHSA-2026:20589** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-05-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:20589)\n- **RHSA-2026:34508** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-07-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:34508)\n- **RHSA-2026:19373** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:19373)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4890.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":41.3,"likelihood":1.8,"exploitation":0,"ransomware":0},"changes":[{"seq":230200,"id":"CVE-2026-4890","ts":1793127710830,"field":"epss","old":"0.01068","new":"0.08849"},{"seq":210768,"id":"CVE-2026-4890","ts":1790325690641,"field":"epss","old":"0.08849","new":"0.01068"}]}