CVE-2025-12790

Rubygem-mqtt: rubygem-mqtt hostname validation

State: Published
Severity: 7.4 High
Published: Nov 6, 2025
Updated: Feb 26, 2026
Reserved: Nov 6, 2025

Description

A flaw was found in Rubygem MQTT. By default, the package used to not have hostname validation, resulting in possible Man-in-the-Middle (MITM) attack.

Scores

CVSS	Score	Vector	Source
3.1	7.4 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N	redhat

Weaknesses

CWE-29 Path Traversal: '..filename'

Affected Products

Product	Versions
ruby-mqttNicholas J Humfrey	before 0.7.0Affected
Red Hat Satellite 6Red Hat
Red Hat Satellite 6Red Hat

References

https://access.redhat.com/security/cve/CVE-2025-12790vdb-entry
RHBZ#2413004issue-tracking
https://github.com/njh/ruby-mqtt/blob/main/NEWS.md#ruby-mqtt-version-070-2025-10-29

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