CVE-2026-4891

CVSS 5.3 MEDIUMEPSS 5.7%CWE-125

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.3EPSS 5.7%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

11 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

dnsmasq · dnsmasq

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References

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/security/cve/CVE-2026-4891 https://bugzilla.redhat.com/show_bug.cgi?id=2458517 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://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4891.json https://thekelleys.org.uk/dnsmasq/CVE/https://www.kb.cert.org/vuls/id/471747