Detections
Analytics
CVE-2026-4891
high
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.
References
https://kb.cert.org/vuls/id/471747
https://www.kb.cert.org/vuls/id/471747
https://thekelleys.org.uk/dnsmasq/CVE/
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4891.json
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
https://github.com/pi-hole/FTL/releases/tag/v6.6.2
https://github.com/NixOS/nixpkgs/pull/519093
https://github.com/NixOS/nixpkgs/pull/519082
https://bugzilla.redhat.com/show_bug.cgi?id=2458517
https://access.redhat.com/security/cve/CVE-2026-4891
https://access.redhat.com/errata/RHSA-2026:34508
https://access.redhat.com/errata/RHSA-2026:20589