CVE-2026-4891

Published: May 11, 2026Modified: Jul 23, 2026

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary)

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.

Related CWEs

CWE-125

Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

References (14)

https://github.com/NixOS/nixpkgs/pull/519082

Source: cret@cert.org

https://github.com/NixOS/nixpkgs/pull/519093

Source: cret@cert.org

https://github.com/pi-hole/FTL/releases/tag/v6.6.2

Source: cret@cert.org

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html

Source: cret@cert.org

https://thekelleys.org.uk/dnsmasq/CVE/

Source: cret@cert.org

https://www.kb.cert.org/vuls/id/471747

Source: cret@cert.org

https://access.redhat.com/errata/RHSA-2026:19158