dnsmasq CNAME Cache Pollution via Unverified DNS Response
CVE-2026-93008 Published on October 29, 2026

Dnsmasq: dnsmasq: out-of-bailiwick cache injection through cname chase in split-dns configurations
A flaw was found in dnsmasq. When following a CNAME in a DNS response, the resolver can cache records for the CNAME target without checking that those records belong to the responding server's authorized zone. In split-DNS deployments that send some domains to a specific upstream, an attacker who controls that upstream can inject cache entries for unrelated names. Later clients may then receive attacker-chosen addresses for those names.

NVD

Vulnerability Analysis

CVE-2026-93008 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
NONE
Integrity Impact:
HIGH
Availability Impact:
NONE

Timeline

Reported to Red Hat.

Made public. 44 days later.

Weakness Type

Insufficient Verification of Data Authenticity

The software does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.


Products Associated with CVE-2026-93008

Want to know whenever a new CVE is published for Red Hat products? stack.watch will email you.

Red Hat Ceph Storage
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Openshift
 
Red Hat Openstack
 

Affected Versions

Red Hat Ceph Storage 9: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat OpenShift Container Platform 4: Red Hat OpenShift Container Platform 4: Red Hat OpenShift Container Platform 4: Red Hat OpenShift Container Platform 4: Red Hat OpenStack Platform 13 (Queens): Red Hat OpenStack Platform 18.0: