What is CVE-2026-4891?

CVE-2026-4891 is a medium-severity vulnerability in Dnsmasq, classified under CWE-125: OUT-OF-BOUNDS READ. CVSS score: 5.3/10. Published 2026-05-11.

How severe is CVE-2026-4891?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Dnsmasq

CVE-2026-4891

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

EPSS: 0.001 (21.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Dnsmasq — versions 0, 2.93, 2.92rel2

References

cret@cert.org
cret@cert.org
cret@cert.org
cret@cert.org
cret@cert.org
cret@cert.org
cret@cert.org

Frequently asked questions

What is CVE-2026-4891?: CVE-2026-4891 is a medium-severity vulnerability in Dnsmasq, classified under CWE-125: OUT-OF-BOUNDS READ. CVSS score: 5.3/10. Published 2026-05-11.
How severe is CVE-2026-4891?: Medium severity. CVSS v3 base score is 5.3 out of 10.