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dnsmasq CVE-2026-13002

| EUVDEUVD-2026-58674 MEDIUM
Loop with Unreachable Exit Condition (Infinite Loop) (CWE-835)
2026-08-14 redhat GHSA-gf7x-hg8h-x3gf
Medium
Disputed · 4.4 Vendor: redhat
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Severity by source

Sources disagree (Low–High)
Vendor (redhat) PRIMARY
4.4 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.9 MEDIUM

Attack is delivered over the network via DNS response (AV:N); controlling a DNSSEC zone is a high-complexity attacker precondition (AC:H); no privilege is required on the victim system (PR:N); impact is availability-only (A:H, C/I:N).

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
4.4 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Aug 14, 2026 - 15:48 vuln.today
CVE Published
Aug 14, 2026 - 15:02 cve.org
MEDIUM 4.4

DescriptionCVE.org

A flow has been identified into dnssec.c library, causing an infinite loop to dnsmasq service. An attacker who controls any DNSSEC-signed zone can hang the dnsmasq process with a single crafted response, killing all DNS resolution for its clients.

AnalysisAI

Denial of service in dnsmasq's DNSSEC validation code allows an attacker who operates any DNSSEC-signed authoritative zone to permanently hang the dnsmasq process with a single crafted DNS response, killing all DNS resolution for every client served by that instance. Affected deployments include dnsmasq as packaged in Red Hat Enterprise Linux 6 through 10 and Red Hat OpenShift Container Platform 4. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Two specific conditions must both be met: the victim dnsmasq instance must have DNSSEC validation explicitly enabled via the 'dnssec' option in dnsmasq.conf (not enabled by default in all distributions), and the attacker must operate or control a DNSSEC-signed authoritative DNS zone that the victim resolver is induced to query. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD-assigned vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H (4.4 Medium) contains a material inconsistency: AV:L asserts that the attacker requires local access to the target host, yet the description explicitly states the attack is delivered via a crafted DNS response from a network-accessible attacker-controlled authoritative zone - a fundamentally remote delivery mechanism. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the dnsmasq package update distributed by Red Hat for the relevant RHEL stream (6, 7, 8, 9, or 10) or OpenShift Container Platform 4, as detailed in the vendor advisory at https://access.redhat.com/security/cve/CVE-2026-13002. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.4 Affected
SUSE Linux Enterprise Micro 5.5 Affected

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CVE-2026-13002 vulnerability details – vuln.today

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