CVE-2026-5172

Published: May 11, 2026Modified: Jul 15, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary)

Description

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.

Related CWEs

CWE-125

Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

References (10)

https://github.com/NixOS/nixpkgs/pull/519082

Source: cret@cert.org

https://github.com/NixOS/nixpkgs/pull/519093

Source: cret@cert.org

https://github.com/pi-hole/FTL/releases/tag/v6.6.2

Source: cret@cert.org

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html

Source: cret@cert.org

https://thekelleys.org.uk/dnsmasq/CVE/

Source: cret@cert.org

https://www.kb.cert.org/vuls/id/471747

Source: cret@cert.org

https://access.redhat.com/errata/RHSA-2026:19158

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://access.redhat.com/security/cve/CVE-2026-5172

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://bugzilla.redhat.com/show_bug.cgi?id=2458521

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5172.json

Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Timeline

No history available yet.