What is CVE-2026-2291?

CVE-2026-2291 is a high-severity vulnerability in Dnsmasq, classified under CWE-190: INTEGER OVERFLOW OR WRAPAROUND. CVSS score: 7.3/10. Published 2026-05-11.

How severe is CVE-2026-2291?

High severity. CVSS v3 base score is 7.3 out of 10.

Is CVE-2026-2291 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Dnsmasq

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.

EPSS: 0.001 (22.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Dnsmasq — versions 0, 2.93, 2.92rel2

Public proof-of-concept exploits

JianrongXiao-Linksys/dnsmasq-cve-2026

References

Frequently asked questions

What is CVE-2026-2291?: CVE-2026-2291 is a high-severity vulnerability in Dnsmasq, classified under CWE-190: INTEGER OVERFLOW OR WRAPAROUND. CVSS score: 7.3/10. Published 2026-05-11.
How severe is CVE-2026-2291?: High severity. CVSS v3 base score is 7.3 out of 10.
Is CVE-2026-2291 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.