Is CVE-2026-2291 in the CISA KEV catalog?

No. CVE-2026-2291 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-2291?

CVE-2026-2291 has a CVSS v3 base score of 7.3 (Moderate).

What is the EPSS score for CVE-2026-2291?

CVE-2026-2291 has an EPSS score of 0.75% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-2291?

Upgrade dnsmasq on debian 11 to 2.85-1+deb11u2 or later. Fixes are available for 12 affected products.

CVE & CISA-KEV Catalog

CVE-2026-2291

MEDIUM

7.3

CVSS v3

NVD

Description

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.

How to fix

Remediation Available

dnsmasqDebian

Fixed in:2.85-1+deb11u2CVE-2026-2291

Fixed in:2.90-4~deb12u2CVE-2026-2291

Fixed in:2.91-1+deb13u1CVE-2026-2291

Fixed in:2.92-5CVE-2026-2291

dnsmasqRocky

Fixed in:0:2.90-7.el10_2RHSA-2026:19158

Fixed in:0:2.79-36.el8_10RHSA-2026:20589

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

dnsmasqRed Hat / RHEL

Fixed in:0:2.90-7.el10_2RHSA-2026:19158

Fixed in:0:2.79-36.el8_10RHSA-2026:20589

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

dnsmasq-debuginfoRed Hat / RHEL

Fixed in:0:2.90-7.el10_2RHSA-2026:19158

Fixed in:0:2.79-36.el8_10RHSA-2026:20589

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

dnsmasq-debuginfoRocky

Fixed in:0:2.90-7.el10_2RHSA-2026:19158

Fixed in:0:2.79-36.el8_10RHSA-2026:20589

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

dnsmasq-debugsourceRed Hat / RHEL

Fixed in:0:2.90-7.el10_2RHSA-2026:19158

Fixed in:0:2.79-36.el8_10RHSA-2026:20589

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

dnsmasq-debugsourceRocky

Fixed in:0:2.90-7.el10_2RHSA-2026:19158

Fixed in:0:2.79-36.el8_10RHSA-2026:20589

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

dnsmasq-utilsRocky

Fixed in:0:2.90-7.el10_2RHSA-2026:19158

Fixed in:0:2.79-36.el8_10RHSA-2026:20589

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

dnsmasq-utilsRed Hat / RHEL

Fixed in:0:2.90-7.el10_2RHSA-2026:19158

Fixed in:0:2.79-36.el8_10RHSA-2026:20589

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

dnsmasq-utils-debuginfoRed Hat / RHEL

Fixed in:0:2.90-7.el10_2RHSA-2026:19158

Fixed in:0:2.79-36.el8_10RHSA-2026:20589

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

dnsmasq-utils-debuginfoRocky

Fixed in:0:2.90-7.el10_2RHSA-2026:19158

Fixed in:0:2.79-36.el8_10RHSA-2026:20589

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

Fixed in:0:2.85-18.el9_8.1RHSA-2026:19373

Fixed in:0:2.85-17.el9_6.1RHSA-2026:34508

dnsmasqUbuntu

Fixed in:2.68-1ubuntu0.2+esm5USN-8268-1

Fixed in:2.90-0ubuntu0.16.04.1+esm3USN-8268-1

Fixed in:2.90-0ubuntu0.18.04.1+esm3USN-8268-1

Fixed in:2.90-0ubuntu0.20.04.1+esm2USN-8268-1

Fixed in:2.90-0ubuntu0.22.04.3USN-8268-1

Fixed in:2.90-2ubuntu0.3USN-8268-1

Fixed in:2.91-1ubuntu0.2USN-8268-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.75%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Other references7

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.