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CVE-2025-12790

Rubygem-mqtt: rubygem-mqtt hostname validation

CVSS 7.4 HIGHEPSS 0.3%CWE-29
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 7.4EPSS 0.3%KEV nãoPoC —Patch —
Lifecycle
06 Nov 2025Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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-mqttRed Hat · Red Hat Satellite 6

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