What is CVE-2026-4891?

CVE-2026-4891 is a medium-severity vulnerability in Dnsmasq, classified under 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.

Out-of-bounds Read 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.

Vulnerability class: Buffer Overflow

EPSS: 0.062 (92.7th 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

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

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0b0ca135-0b70-47e7-9f44-1890c2a1c46c
0b0ca135-0b70-47e7-9f44-1890c2a1c46c
0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Frequently asked questions

What is CVE-2026-4891?: CVE-2026-4891 is a medium-severity vulnerability in Dnsmasq, classified under 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.