CVE-2025-12790

Rubygem-mqtt: rubygem-mqtt hostname validation

Published Nov 6, 2025 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-9c5q-w6gr-fxcq MQTT does not validate hostnames
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Rubygem-mqtt: rubygem-mqtt hostname validation
First Time appeared Redhat
Redhat satellite
Weaknesses CWE-29
CPEs cpe:/a:redhat:satellite:6
Vendors & Products Redhat
Redhat satellite
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Feb 26, 2026, 5:47 PM
Reserved
Nov 6, 2025, 3:33 AM
Status
Deferred
Published
Nov 6, 2025, 9:15 PM
Modified
Oct 18, 2026, 9:10 PM
Severity
Important
Public date
Nov 6, 2025, 12:00 AM