CVE-2026-12725: Red Hat Enterprise Linux

Medium severity, CVSS 5.9. EPSS: 0.5% chance of exploitation in the next 30 days.

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 products

• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Red Hat Openshift Container Platform: from 4.0, up to and including 4.22.1
• Thekelleys Dnsmasq: before 2.93 (fixed in 2.93)

Published 2026-06-22. Last modified 2026-08-31.