{"id":"CVE-2026-4891","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-4891","generatedAt":"2026-10-27T23:56:13.165Z","title":"A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.","description":"A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.","published":"2026-05-11T18:16:41.000Z","lastModified":"2026-08-25T13:19:22.000Z","status":"Awaiting Analysis","sourceIdentifier":"cret@cert.org","cvss":{"version":"3.1","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"cwe":["CWE-125"],"affected":[],"epss":{"score":0.06411,"percentile":0.93641,"date":"2026-10-26","history":[{"date":"2026-09-24","score":0.00836,"percentile":0.55889},{"date":"2026-10-25","score":0.06411,"percentile":0.93641}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (6.41%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-25T00:00:00.000Z","detail":{"to":0.06411,"from":0.00836,"percentile":0.93641},"summary":"EPSS moved from 0.8% to 6.4% probability of exploitation in the next thirty days."}],"references":[{"url":"https://github.com/NixOS/nixpkgs/pull/519082","source":"cret@cert.org"},{"url":"https://github.com/NixOS/nixpkgs/pull/519093","source":"cret@cert.org"},{"url":"https://github.com/pi-hole/FTL/releases/tag/v6.6.2","source":"cret@cert.org"},{"url":"https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html","source":"cret@cert.org"},{"url":"https://thekelleys.org.uk/dnsmasq/CVE/","source":"cret@cert.org"},{"url":"https://www.kb.cert.org/vuls/id/471747","source":"cret@cert.org"},{"url":"https://access.redhat.com/errata/RHSA-2026:19158","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19373","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:20589","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:34508","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:40762","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-4891","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458517","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4891.json","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-4891","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}