7.3

CVE-2026-2291: dnsmasq

CVSS: 7.3v3.1HighAwaiting analysis
AliasesALPINE-CVE-2026-2291UBUNTU-CVE-2026-2291DEBIAN-CVE-2026-2291
Published 11-05-2026Last modified 20-07-2026
Open JSON

Vulnerability summary

CVE-2026-2291 is a high (CVSS 7.3) vulnerability in dnsmasq. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 48.2% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.61%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 7
MGASA-2026-0135OPENSUSE-SU-2026:10821-1OPENSUSE-SU-2026:21192-1RHSA-2026:19158RHSA-2026:19373RHSA-2026:20589

Timeline

  1. 11-05-2026
    PublishedVulnerability first disclosed.
  2. 20-07-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.61%

Chance of exploitation in the next 30 days

Percentile

48%

Versus all other CVEs

30-day change

0.00 pp

From 0.61% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.61%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Chainguard2 products
  • dnsmasq< 2.93-r0
  • dnsmasq-doc< 2.93-r0
Wolfi2 products
  • dnsmasq< 2.93-r0
  • dnsmasq-doc< 2.93-r0
Alpine1 product
  • dnsmasq< 2.91-r1 | < 2.92_p2-r0
Debian1 product
  • dnsmasq< 2.90-4~deb12u2 | < 2.91-1+deb13u1 | < 2.92-5
Dnsmasq1 product
Ubuntu1 product
  • dnsmasq< 2.68-1ubuntu0.2+esm5 | < 2.90-0ubuntu0.16.04.1+esm3 | < 2.90-0ubuntu0.18.04.1+esm3 | < 2.90-0ubuntu0.20.04.1+esm2 | < 2.90-0ubuntu0.22.04.3 | < 2.90-2ubuntu0.3 | < 2.91-1ubuntu0.2 | < 2.92-1ubuntu0.2

6 vendors · 8 products

References

15 links
Show all 15 references