CVE-2026-4891
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 6.4%
exploitation probability
6.4%top 7% of all CVEs
observed exploitation
nono source reports it
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 · dnsmasqReferences
https://access.redhat.com/errata/RHSA-2026:19158https://access.redhat.com/errata/RHSA-2026:19373https://access.redhat.com/errata/RHSA-2026:20589https://access.redhat.com/errata/RHSA-2026:34508https://access.redhat.com/errata/RHSA-2026:40762https://access.redhat.com/security/cve/CVE-2026-4891https://bugzilla.redhat.com/show_bug.cgi?id=2458517https://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://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4891.json