CVE-2026-4891: exploitation status and patch state

CVE-2026-4891 · CVSS 5.3 MEDIUM · patch available

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.

Is CVE-2026-4891 exploited?

• Not in the CISA KEV catalog.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

• CBL-Mariner Releases

What PlainSec published about CVE-2026-4891

• dnsmasq Flaws Span DNS Poisoning and Local Root (2026-05-13)

Primary sources

• NVD record

What this record does not say

• No EPSS score.
• No affected package data.

KEV and EPSS are re-checked daily. Record last updated 2026-08-11.