PT-2026-39699 · Dnsmasq · Dnsmasq

Published 2026-05-11 · Updated 2026-05-11 · CVE-2026-4891

Mitre

CVSS v3.1

5.3

Medium

Base vector

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

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.

Fix

Related Identifiers

CVE-2026-4891

Affected Products

Dnsmasq

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-4891 · Security Note
• https://kb.cert.org/vuls/id/471747 · Note
• https://thekelleys.org.uk/dnsmasq/CVE · Note
• https://thekelleys.org.uk/dnsmasq · Note
• https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html · Note
• https://reddit.com/r/SecOpsDaily/comments/1ta9kll/vu471747_dnsmasq_contains_several_vulnerabilities · Reddit Post
• https://github.com/NixOS/nixpkgs/pull/519093 · Note
• https://github.com/NixOS/nixpkgs/pull/519082 · Note