CNAME Caching Flaw in dnsmasq Affects Network Security
CVE-2026-93008

6.8MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Ceph Storage 9
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Vendor
CVE Published:
29 October 2026

What is CVE-2026-93008?

A vulnerability in dnsmasq allows for the caching of CNAME target records without proper authorization checks. This situation can arise in split-DNS configurations where specific domains are forwarded to designated upstream servers. If an attacker gains control of this upstream server, they can manipulate cached entries, leading clients to receive deceptive addresses for unrelated domain names. This flaw compromises the integrity of DNS responses, which can be exploited for phishing attacks or redirection to malicious sites.

References

https://access.redhat.com/security/cve/CVE-2026-93008
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2536079
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue.
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