High 7.3Published May 11, 2026

CVE-2026-5172CVE-2026-5172

Updated under an hour ago (Oct 26, 2026, 10:30 AM ET)

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It affects dnsmasq and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for dnsmasq

Exploited in the last 30 days

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.

CVSS: 7.3 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness (CWE): CWE-787, CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: certcc
NVD analysis: Awaiting Analysis
Record last updated: Sep 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

dnsmasq dnsmasq dnsmasq:dnsmasq (from the name)	before 2.92rel2	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:2.90-7.el10_2 not affected	CISA ADP
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift	4	CISA ADP

References

https://www.kb.cert.org/vuls/id/471747
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
https://thekelleys.org.uk/dnsmasq/CVE/
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://access.redhat.com/errata/RHSA-2026:19158
https://access.redhat.com/security/cve/CVE-2026-5172
https://bugzilla.redhat.com/show_bug.cgi?id=2458521
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5172.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.