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Vulnerability record · CVE-2025-12790 · published 6 November 2025

CVE-2025-12790: A flaw was found in Rubygem MQTT.

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.

7.4 CVSS 3.1 High EPSS 0.35% · top 73.8% CWE-29 · CWE-29 Deferred
7.4CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2025-12790), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.