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CVE-2026-4891

CVE-2026-4891

CVSS 5.3 MEDIUMEPSS 2.5%
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://github.com/NixOS/nixpkgs/pull/519082https://github.com/NixOS/nixpkgs/pull/519093https://github.com/pi-hole/FTL/releases/tag/v6.6.2https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.htmlhttps://thekelleys.org.uk/dnsmasq/CVE/https://www.kb.cert.org/vuls/id/471747