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CVE-2026-4890

38
FAUCET Score

A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

First published: May 11, 2026Last modified: May 20, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 0, < 2.92rel2CPE match
cpe:2.3:a:dnsmasq:dnsmasq:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
7.24%
Probability of exploitation in next 30 days
EPSS Percentile
93.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0724 is in the 89th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

microsoftpatch availablevia msrc
Product: 21387-17084Fixed in: 2.92-1
microsoftpatch availablevia msrc
Product: 21230-17084Fixed in: 2.92-1
microsoftpatch availablevia msrc
Product: azl3 dnsmasq 2.90-1 on Azure Linux 3.0Fixed in: 2.92-1
microsoftpatch availablevia msrc
Product: azl3 dnsmasq 2.92-1 on Azure Linux 3.0Fixed in: 2.92-1

Vendor Advisories (1)

microsoft2026-May/CVE-2026-4890Moderate

CVE-2026-4890

May 12, 2026

References

access.redhat.com / errata/RHSA-2026:19158
access.redhat.com / errata/RHSA-2026:19373
access.redhat.com / errata/RHSA-2026:20589
access.redhat.com / errata/RHSA-2026:34508
access.redhat.com / errata/RHSA-2026:40762
access.redhat.com / security/cve/CVE-2026-4890
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-4890.json
github.com / NixOS/nixpkgs/pull/519082
github.com / NixOS/nixpkgs/pull/519093
github.com / pi-hole/FTL/releases/tag/v6.6.2
lists.thekelleys.org.uk / pipermail/dnsmasq-discuss/2026q2/018471.html
thekelleys.org.uk / dnsmasq/CVE
kb.cert.org / vuls/id/471747