CVE-2026-4891

EUVD-2026-29153
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 92.85%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
Red HatRed Hat Enterprise Linux 10
0:2.90-7.el10_2 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8
0:2.79-36.el8_10 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9
0:2.85-18.el9_8.1 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support
0:2.85-17.el9_6.1 ≤
𝑥
< *
ADP
Red HatRed Hat OpenShift Container Platform 4.19
4.19.9.6.202607151909-0 ≤
𝑥
< *
ADP
Debian logo
Debian Releases
Debian Product
Codename
dnsmasq
bookworm
2.90-4~deb12u2
fixed
bookworm (security)
2.90-4~deb12u2
fixed
bullseye
vulnerable
bullseye (security)
2.85-1+deb11u2
fixed
forky
2.93-1
fixed
sid
2.93-1
fixed
trixie
2.91-1+deb13u1
fixed
trixie (security)
2.91-1+deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
dnsmasq
bionic
Fixed 2.90-0ubuntu0.18.04.1+esm3
released
focal
Fixed 2.90-0ubuntu0.20.04.1+esm2
released
jammy
Fixed 2.90-0ubuntu0.22.04.3
released
noble
Fixed 2.90-2ubuntu0.3
released
questing
Fixed 2.91-1ubuntu0.2
released
resolute
Fixed 2.92-1ubuntu0.2
released
trusty
not-affected
xenial
Fixed 2.90-0ubuntu0.16.04.1+esm3
released
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
dnsmasq
RHEL 8
0:2.79-36.el8_10
fixed
RHEL 9
0:2.85-18.el9_8.1
fixed
dnsmasq-utils
RHEL 8
0:2.79-36.el8_10
fixed
RHEL 9
0:2.85-18.el9_8.1
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
dnsmasq
Amazon Linux 2023
0:2.90-1.amzn2023.0.3
fixed
dnsmasq-debuginfo
Amazon Linux 2023
0:2.90-1.amzn2023.0.3
fixed
dnsmasq-debugsource
Amazon Linux 2023
0:2.90-1.amzn2023.0.3
fixed
dnsmasq-utils
Amazon Linux 2023
0:2.90-1.amzn2023.0.3
fixed
dnsmasq-utils-debuginfo
Amazon Linux 2023
0:2.90-1.amzn2023.0.3
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
dnsmasq
Azure Linux 3.0
0:2.92-1.azl3
fixed
Common Weakness Enumeration
References
https://github.com/NixOS/nixpkgs/pull/519082
https://github.com/NixOS/nixpkgs/pull/519093
https://github.com/pi-hole/FTL/releases/tag/v6.6.2
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
https://thekelleys.org.uk/dnsmasq/CVE/
https://www.kb.cert.org/vuls/id/471747
https://access.redhat.com/errata/RHSA-2026:19158
https://access.redhat.com/errata/RHSA-2026:19373
https://access.redhat.com/errata/RHSA-2026:20589
https://access.redhat.com/errata/RHSA-2026:34508
https://access.redhat.com/errata/RHSA-2026:40762
https://access.redhat.com/security/cve/CVE-2026-4891
https://bugzilla.redhat.com/show_bug.cgi?id=2458517
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4891.json