What is CVE-2026-12725?

CVE-2026-12725 is a medium-severity vulnerability in Thekelleys Dnsmasq, classified under Heap-based Buffer Overflow. CVSS score: 5.9/10. Published 2026-06-22.

How severe is CVE-2026-12725?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Buffer overflow in Thekelleys Dnsmasq

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 in…

Vulnerability class: Buffer Overflow

EPSS: 0.004 (33.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

secalert@redhat.com (x_refsource_REDHAT, Mitigation, vdb-entry, Vendor Advisory)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-12725?: CVE-2026-12725 is a medium-severity vulnerability in Thekelleys Dnsmasq, classified under Heap-based Buffer Overflow. CVSS score: 5.9/10. Published 2026-06-22.
How severe is CVE-2026-12725?: Medium severity. CVSS v3 base score is 5.9 out of 10.