CVE-2026-5172

EUVD-2026-29156
A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.3 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 46%
Debian logo
Debian Releases
Debian Product
Codename
dnsmasq
bookworm
2.90-4~deb12u2
fixed
bookworm (security)
2.90-4~deb12u2
fixed
bullseye
2.85-1
fixed
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
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
Vulnerability Media Exposure
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