CVE-2026-4891
5.3
MEDIUM
CVSS 3.1
EPSS 0.07%
Description
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.
How to fix CVE-2026-4891
To remediate CVE-2026-4891, upgrade the affected package to a fixed version below.
- Alpine/dnsmasq—upgrade to 2.91-r1 or later
- Debian/dnsmasq—no fix listed
Is CVE-2026-4891 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.91-r1
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |