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Vulnerabilities

Vulnerability · CVE-2026-93011

A flaw was found in dnsmasq.

Published Oct 29, 2026 · catalog updated Oct 31, 2026 · A flaw was found

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-93011. EPSS is 0.63%. Act only if a listed version of A flaw was found is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A flaw was found).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.63%
Remediation
Advisory link
Affected products
Debian:12 dnsmasq · Debian:13 dnsmasq · Debian:14 dnsmasq · Ubuntu:22.04:LTS dnsmasq · Ubuntu:24.04:LTS dnsmasq · Ubuntu:26.04:LTS dnsmasq

A flaw was found in dnsmasq. After a reduction of internal domain-name buffer sizes, the DNSSEC validator can write a few bytes past a name buffer when converting names to and from DNS wire format. An attacker who can cause the server to validate a crafted DNSSEC response may overwrite a small amount of adjacent heap metadata. DNSSEC support is not compiled in by default and must also be enabled at runtime.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 dnsmasq2.89-1, 2.90-1, 2.90-2
  • Debian:13 dnsmasq2.91-1, 2.91-1+deb13u1, 2.91-1+deb13u2
  • Debian:14 dnsmasq2.91-1, 2.92-1, 2.92-1+exp1
  • Ubuntu:22.04:LTS dnsmasq2.85-1ubuntu2, 2.86-1.1, 2.86-1.1ubuntu0.1
  • Ubuntu:24.04:LTS dnsmasq2.89-1, 2.90-2, 2.90-2build1
  • Ubuntu:26.04:LTS dnsmasq2.91-1build1, 2.92~rc3-1, 2.92-1
  • Ubuntu:26.10 dnsmasq2.92-1, 2.93-1, 2.93-3ubuntu1
  • Ubuntu:Pro:14.04:LTS dnsmasq2.66-4ubuntu1, 2.67-1, 2.68-1
  • Ubuntu:Pro:16.04:LTS dnsmasq2.75-1, 2.75-1ubuntu0.16.04.1, 2.75-1ubuntu0.16.04.2
  • Ubuntu:Pro:18.04:LTS dnsmasq2.78-1, 2.78-3, 2.79-1
  • Ubuntu:Pro:20.04:LTS dnsmasq2.80-1ubuntu2, 2.80-1ubuntu4, 2.80-1.1ubuntu1

How to fix CVE-2026-93011

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-93011. EPSS is 0.63%. Act only if a listed version of A flaw was found is installed.

Which versions are affected?

Compare what you have installed with 2.89-1, 2.90-1, 2.90-2, 2.91-1, 2.91-1+deb13u1, 2.91-1+deb13u2, 2.91-1, 2.92-1, 2.92-1+exp1, 2.85-1ubuntu2, 2.86-1.1, 2.86-1.1ubuntu0.1, 2.89-1, 2.90-2, 2.90-2build1, 2.91-1build1, 2.92~rc3-1, 2.92-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.63%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian securityUbuntu security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 29, 2026 · Trivy Vulnerability DB

    Detected

  2. Oct 29, 2026 · Trivy Vulnerability DB

    Updated

    The description or metadata changed.

  3. Oct 31, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    A flaw was found in dnsmasq. After a reduction of internal domain-name buffer sizes, the DNSSEC validator can write a few bytes past a name buffer when converting names to and from DNS wire format. An attacker who can cause the server to validate a crafted DNSSEC response may overwrite a small amount of adjacent heap metadata. DNSSEC support is not compiled in by default and must also be enabled a

Sources

  • CVE.orgVulnerability recordCVE-2026-93011

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-93011

    30-day exploitation probability 0.63%

    first.org
  • OpenSSF OSV / OSV ScannerPackage advisoryUBUNTU-CVE-2026-93011
    osv.dev
  • Tenable CVE DatabaseVulnerability recordCVE-2026-93011

    A flaw was found in dnsmasq. After a reduction of internal domain-name buffer sizes, the DNSSEC validator can write a few bytes past a name buffer when converting names to and from DNS wire format. An attacker who can cause the server to validate a crafted DNSSEC response may overwrite a small amount of adjacent heap metadata. DNSSEC support is not compiled in by default and must also be enabled a

    tenable.com
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-93011
    osv.dev

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • OpenSSF OSV / OSV ScannerNov 2, 2026
  • Tenable CVE DatabaseOct 31, 2026
  • CVE.orgOct 29, 2026
  • Trivy Vulnerability DBOct 29, 2026