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Medium 5.3Published May 11, 2026
CVE-2026-4891CVE-2026-4891
Updated under an hour ago ()
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It affects dnsmasq and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-125
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- certcc
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
dnsmasq dnsmasq dnsmasq:dnsmasq (from the name) | before 2.92rel2 | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:2.90-7.el10_2 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:2.85-17.el9_6.1 not affected | CISA ADP |
Red Hat Red Hat OpenShift Container Platform 4.19 redhat:openshift | from 4.19.9.6.202607151909-0 not affected | CISA ADP |
References
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
- https://www.kb.cert.org/vuls/id/471747
- https://thekelleys.org.uk/dnsmasq/CVE/
- https://github.com/NixOS/nixpkgs/pull/519082
- https://github.com/NixOS/nixpkgs/pull/519093
- https://github.com/pi-hole/FTL/releases/tag/v6.6.2
- https://access.redhat.com/errata/RHSA-2026:19158
- https://access.redhat.com/errata/RHSA-2026:19373
- https://access.redhat.com/errata/RHSA-2026:20589
- https://access.redhat.com/errata/RHSA-2026:34508
- https://access.redhat.com/errata/RHSA-2026:40762
- https://access.redhat.com/security/cve/CVE-2026-4891
- https://bugzilla.redhat.com/show_bug.cgi?id=2458517
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4891.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.