CVE-2025-12790

Rubygem-mqtt: rubygem-mqtt hostname validation

CVSS 7.4 HIGHEPSS 0.3%CWE-29

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

Affected products

Nicholas J Humfrey · ruby-mqtt Red Hat · Red Hat Satellite 6

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References

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