CVE-2026-4891

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published5/11/2026

Last Modified5/12/2026

Sourcenvd

Honeypot Sightings0

References

https://github.com/NixOS/nixpkgs/pull/519082(cret@cert.org)

https://github.com/NixOS/nixpkgs/pull/519093(cret@cert.org)

https://github.com/pi-hole/FTL/releases/tag/v6.6.2(cret@cert.org)

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html(cret@cert.org)

https://thekelleys.org.uk/dnsmasq/CVE/(cret@cert.org)

https://www.kb.cert.org/vuls/id/471747(cret@cert.org)

IOC Correlations

No correlations recorded

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