CVE-2026-5172

CVE-2026-5172

Published May 11, 2026 CVSS 3.1 · 7.3 High EPSS 2.7% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6264-1 dnsmasq security update
Ubuntu USN Ubuntu USN USN-8268-1 Dnsmasq vulnerabilities
History
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'}

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important

Type Values Removed Values Added
First Time appeared Dnsmasq
Dnsmasq dnsmasq
Weaknesses CWE-125
Vendors & Products Dnsmasq
Dnsmasq dnsmasq
Type Values Removed Values Added
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.
Title CVE-2026-5172
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
certcc
Published
Updated
Sep 1, 2026, 12:04 PM
Reserved
Mar 30, 2026, 3:54 PM
Status
Awaiting Analysis
Published
May 11, 2026, 6:16 PM
Modified
Aug 24, 2026, 1:19 PM
Severity
Important
Public date
May 9, 2026, 12:00 AM