Insufficient Hostname Validation in Rubygem MQTT
CVE-2025-12790

7.4HIGH

Key Information:

Vendor

Nicholas J Humfrey

Status
Ruby-MQtt
Red Hat Satellite 6
Vendor
CVE Published:
6 November 2025

What is CVE-2025-12790?

A flaw exists in Rubygem MQTT where the default configuration lacks hostname validation. This oversight can enable attackers to perform Man-in-the-Middle (MITM) attacks, compromising the integrity and confidentiality of communications. Users are advised to review their configurations and update to the latest version to safeguard against potential exploits.

Affected Version(s)

ruby-mqtt 0 < 0.7.0

References

https://access.redhat.com/security/cve/CVE-2025-12790
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2413004
issue-trackingx_refsource_REDHAT
https://github.com/njh/ruby-mqtt/blob/main/NEWS.md#ruby-m...

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.