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CVE-2025-12790 — Vulnerability in mqtt — CVE Details

HIGH

MQTT does not validate hostnames

Published November 6, 2025Updated November 7, 2025Source: osv

Summary

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.

Advisory Timeline

  • First published November 6, 2025 (340 days ago).
  • Last revised November 7, 2025 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update mqtt to 0.7.0 or later
gem install mqtt -v 0.7.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
mqtt
rubygems
0.0.1, 0.0.2, 0.0.3, 0.0.4 (+11 more)0.7.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.4 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2025-12790?
MQTT does not validate hostnames This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.4/10).
How do I check if my project is affected by CVE-2025-12790?
CVE-2025-12790 affects mqtt. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-12790 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.4

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-9c5q-w6gr-fxcq

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