# CVE-2025-12790

## Summary

- **CVE ID:** CVE-2025-12790
- **Severity:** HIGH
- **CVSS Score:** 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
- **CWE:** CWE-29
- **Published:** Nov 6, 2025
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- Nicholas J Humfrey — ruby-mqtt (0)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2025-12790)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2413004)
- [CNA](https://github.com/njh/ruby-mqtt/blob/main/NEWS.md#ruby-mqtt-version-070-2025-10-29)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.35%
- **EPSS Percentile:** 28.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._