CVE-2026-13002: Dnsmasq: infinite loop dos in dnssec nsec/nsec3 type bitmap parsing

Medium severity · published Aug 14, 2026

CVE-2026-13002

Dnsmasq: infinite loop dos in dnssec nsec/nsec3 type bitmap parsing

4.4

CVSS

0.1%

EPSS

On KEV

Description

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.

CVSS vector

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

Attack vector

Local

Complexity

Low

Privileges

High

User interaction

None

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.1% · higher than 4% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Red Hat Enterprise Linux 10 · Red Hat

All versions, or not specified · source: vendor

Red Hat Enterprise Linux 8 · Red Hat

All versions, or not specified · source: vendor

Red Hat Enterprise Linux 9 · Red Hat

All versions, or not specified · source: vendor

Red Hat OpenShift Container Platform 4 · Red Hat

All versions, or not specified · source: vendor

Enterprise Linux · Redhat

6.0; 7.0; 8.0; 9.0; 10.0 · source: NVD

Openshift Container Platform · Redhat

4.0 · source: NVD

Affected product

Red Hat Enterprise Linux 10

Red Hat

All Red Hat Enterprise Linux 10 CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-13002

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-13002

Vendor Advisory

https://access.redhat.com/security/cve/CVE-2026-13002

Issue Tracking

https://bugzilla.redhat.com/show_bug.cgi?id=2486360