This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-12725 →

DEBIAN-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 containi...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 dnsmasq

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 dnsmasq

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.91-1+deb13u2"}]}]

Debian:14 dnsmasq

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.93-1"}]}]

References

advisory security-tracker.debian.org