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CVE-2026-2291· NVD / CVE Program· CNA certcc

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, whic

Noroxi assessment

Priority: Monitor (action score 29/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.61% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: azl3 dnsmasq 2.90-1 on Azure Linux 3.0 2.92-1; azl3 dnsmasq 2.92-1 on Azure Linux 3.0 2.92-1.

Low priority for now. Upgrade to azl3 dnsmasq 2.90-1 on Azure Linux 3.0 2.92-1; azl3 dnsmasq 2.92-1 on Azure Linux 3.0 2.92-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.3 · v3.1—Proof of concept Fix available
Published
May 11, 2026
Updated
Jul 20, 2026
EPSS
0.6% · 48th percentile

Report tools

JSON

Action score

29

Monitor

Low priority for now.

CVSS
29 / 40 · 7.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-2291

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (certcc). Independent of NVD's CPE analysis and usually ahead of it.

  • dnsmasq dnsmasq

    • before 2.92rel2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10dnsmasqbefore 2.90-7.el10_22.90-7.el10_2
AlmaLinux:10dnsmasq-utilsbefore 2.90-7.el10_22.90-7.el10_2
AlmaLinux:8dnsmasqbefore 2.79-36.el8_102.79-36.el8_10
AlmaLinux:8dnsmasq-utilsbefore 2.79-36.el8_102.79-36.el8_10
AlmaLinux:9dnsmasqbefore 2.85-18.el9_8.12.85-18.el9_8.1
AlmaLinux:9dnsmasq-utilsbefore 2.85-18.el9_8.12.85-18.el9_8.1
Alpine:v3.22dnsmasqbefore 2.91-r12.91-r1
Alpine:v3.24dnsmasqbefore 2.92_p2-r02.92_p2-r0
Debian:12dnsmasqbefore 2.90-4~deb12u22.90-4~deb12u2
Debian:13dnsmasqbefore 2.91-1+deb13u12.91-1+deb13u1
Debian:14dnsmasqbefore 2.92-52.92-5
openSUSE:Leap 16.0dnsmasqbefore 2.93-160000.1.12.93-160000.1.1
openSUSE:Tumbleweeddnsmasqbefore 2.92rel2-1.12.92rel2-1.1
Red Hat:enterprise_linux:10.2dnsmasqbefore 0:2.90-7.el10_20:2.90-7.el10_2
Red Hat:enterprise_linux:10.2dnsmasq-debuginfobefore 0:2.90-7.el10_20:2.90-7.el10_2
Red Hat:enterprise_linux:10.2dnsmasq-debugsourcebefore 0:2.90-7.el10_20:2.90-7.el10_2
Red Hat:enterprise_linux:10.2dnsmasq-utilsbefore 0:2.90-7.el10_20:2.90-7.el10_2
Red Hat:enterprise_linux:10.2dnsmasq-utils-debuginfobefore 0:2.90-7.el10_20:2.90-7.el10_2
Red Hat:enterprise_linux:8::appstreamdnsmasqbefore 0:2.79-36.el8_100:2.79-36.el8_10
Red Hat:enterprise_linux:8::appstreamdnsmasq-debuginfobefore 0:2.79-36.el8_100:2.79-36.el8_10
Red Hat:enterprise_linux:8::appstreamdnsmasq-debugsourcebefore 0:2.79-36.el8_100:2.79-36.el8_10
Red Hat:enterprise_linux:8::appstreamdnsmasq-utilsbefore 0:2.79-36.el8_100:2.79-36.el8_10
Red Hat:enterprise_linux:8::appstreamdnsmasq-utils-debuginfobefore 0:2.79-36.el8_100:2.79-36.el8_10
Red Hat:enterprise_linux:9::appstreamdnsmasqbefore 0:2.85-18.el9_8.10:2.85-18.el9_8.1

+15

Same product

dnsmasq: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-4892A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with
    33Monitor
  • CVE-2026-4890A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a craft
    30Monitor
  • CVE-2026-5172A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting
    29Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2005-0876May 2, 2005 · Off-by-one buffer overflow in Dnsmasq before 2.21 may allow attackers to execute arbitrary code via the DHCP lease file.
    21Monitor
  • ← EarlierCVE-2006-2017Apr 25, 2006 · Dnsmasq 2.29 allows remote attackers to cause a denial of service (application crash) via a DHCP client broadcast reply request.
    21Monitor
  • Later →CVE-2026-4891May 11, 2026 · A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 dnsmasq 2.90-1 on Azure Linux 3.02.92-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 dnsmasq 2.92-1 on Azure Linux 3.02.92-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:dnsmasq2.90-7.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:dnsmasq-utils2.90-7.el10_2 · AlmaLinux:10Package registry (OSV)
alpine:dnsmasq2.91-r1 · Alpine:v3.22Package registry (OSV)
debian:dnsmasq2.90-4~deb12u2 · Debian:12Package registry (OSV)
opensuse:dnsmasq2.92rel2-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:dnsmasq0:2.90-7.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:dnsmasq-debuginfo0:2.90-7.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:dnsmasq-debugsource0:2.90-7.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:dnsmasq-utils0:2.90-7.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:dnsmasq-utils-debuginfo0:2.90-7.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:dnsmasq0:2.90-7.el10_2 · Rocky Linux:10Package registry (OSV)
suse:dnsmasq2.93-slfo.1.1_1.1 · SUSE:Linux Micro 6.1Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-06-01

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+20 d
  3. TodayOct 19, 2026+161 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records