Published Jun 22, 2026Sources checked Nov 13, 2026
5.9MEDIUMCVSS out of 10
What this means
Review the available evidence
CVE-2026-12725 and is rated Medium severity with a CVSS score of 5.9. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
What to do next
Remediation and response
Microsoft Security Response Center guidance
Vendor revision: Jun 29, 2026
CBL-Mariner Releases
Vendor-listed releases
2.93-1
CISA KEVNot listedBased on the latest collected catalog
EPSS0.5%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-12725?
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.