CVE-2026-12725

Published: Jun 22, 2026Modified: Jul 8, 2026

5.9

Vector

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

Exploitability: 2.2 / Impact: 3.6

Source: secalert@redhat.com (Secondary)

Description

A heap-based buffer overflow was found in dnsmasq. When DNSSEC validation and query logging are both enabled, logging of DS or DNSKEY replies containing unsupported algorithm or digest types can cause dnsmasq to write past the end of an internal logging buffer. A remote attacker able to supply such a DNS response may crash the dnsmasq process, resulting in denial of service.

Affected (5)

Products: Redhat: Enterprise Linux, Openshift Container Platform · Thekelleys: Dnsmasq

Redhat

2 products

Enterprise Linux

Openshift Container Platform

Thekelleys

1 product

Dnsmasq

Configuration A

4 vulnerable

Vulnerable Software	Affected Versions
Redhat Enterprise Linux	Version 10.0
Redhat Enterprise Linux	Version 8.0
Redhat Enterprise Linux	Version 9.0
Redhat Openshift Container Platform	From 4.0 to 4.22.1

Configuration B

1 vulnerable

Vulnerable Software	Affected Versions
Thekelleys Dnsmasq	Before 2.93

Related CWEs

CWE-122

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

References (2)

https://access.redhat.com/security/cve/CVE-2026-12725

Source: secalert@redhat.com

MitigationVendor Advisory

https://bugzilla.redhat.com/show_bug.cgi?id=2490763

Source: secalert@redhat.com

Issue TrackingVendor Advisory

Timeline

No history available yet.