Vulnerability Report

CVE-2026-2291

Title: Heap Buffer Overflow in dnsmasq

DNS cache poisoning, DoS

Proof Of Concept

PoC Available for CVE-2026-2291

CWE Category NVD-CWE-noinfo

Published Date May 11, 2026

Modified Date May 13, 2026

Exploit Status Available

Score 7.3 CVSS v

Exploit Probability (EPSS)

0.63%

Vulnerability Summary

CVE-2026-2291: 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.

Impacted Vendors

Analysis in Progress...

Reference Links

https://thekelleys.org.uk/dnsmasq/doc.html https://www.kb.cert.org/vuls/id/471747 https://www.suse.com/security/cve/CVE-2026-2291.html

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity HIGH

7.3

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns