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CVE-2026-4893

27
FAUCET Score

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

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

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.68%
Probability of exploitation in next 30 days
EPSS Percentile
84.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0268 is in the 77th percentile among its peer group of 23,701 CVEs.

Social Chatter

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

Media Mentions

The average CVE in this peer group has 0.0 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-2026-4893Moderate

CVE-2026-4893

May 12, 2026

References

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