What is CVE-2025-12790?

CVE-2025-12790 is a high-severity vulnerability in Nicholas J Humfrey Ruby-Mqtt, classified under CWE-29. CVSS score: 7.4/10. Published 2025-11-06.

How severe is CVE-2025-12790?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Nicholas J Humfrey Ruby-Mqtt

CVE-2025-12790

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.

Published 2025-11-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (26.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Nicholas J Humfrey Ruby-Mqtt — versions 0
Red Hat Satellite 6

Weakness classification (CWE)

CWE-29

References

access.redhat.com/security/cve/CVE-2025-12790 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)
github.com/njh/ruby-mqtt/blob/main/NEWS.md

Frequently asked questions

What is CVE-2025-12790?: CVE-2025-12790 is a high-severity vulnerability in Nicholas J Humfrey Ruby-Mqtt, classified under CWE-29. CVSS score: 7.4/10. Published 2025-11-06.
How severe is CVE-2025-12790?: High severity. CVSS v3 base score is 7.4 out of 10.