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CVE-2026-2291

35
FAUCET Score

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.

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

7.3HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.92%
Probability of exploitation in next 30 days
EPSS Percentile
56.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0092 is in the 31st 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 2.92-1 on Azure Linux 3.0Fixed in: 2.92-1
microsoftpatch availablevia msrc
Product: azl3 dnsmasq 2.90-1 on Azure Linux 3.0Fixed in: 2.92-1

Vendor Advisories (1)

microsoft2026-May/CVE-2026-2291Moderate

CVE-2026-2291

May 12, 2026

References

openwall.com / lists/oss-security/2026/07/20/14
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
suse.com / security/cve/CVE-2026-2291.html