CVE-2026-5172CWE-125

CVE-2026-5172

High · published May 11, 2026

CVSS v3.1

7.3

EPSS

Percentile

52.1

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 7.3 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0: Not supplied
EPSS: 0.00687 · 52.1th percentile
Weakness: CWE-125 · Out-of-bounds Read
Published: 2026-05-11T22:16Z

References (10)

https://github.com/NixOS/nixpkgs/pull/519082 · [email protected]https://github.com/NixOS/nixpkgs/pull/519093 · [email protected]https://github.com/pi-hole/FTL/releases/tag/v6.6.2 · [email protected]https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html · [email protected]https://thekelleys.org.uk/dnsmasq/CVE/ · [email protected]https://www.kb.cert.org/vuls/id/471747 · [email protected]https://access.redhat.com/errata/RHSA-2026:19158 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/security/cve/CVE-2026-5172 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://bugzilla.redhat.com/show_bug.cgi?id=2458521 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5172.json · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

EPSS history

Timeline

11 MAY 16:48Z
CVE-2026-5172
cvelistv5