High severity7.4GHSA Advisory· Published Nov 6, 2025· Updated Apr 15, 2026

CVE-2025-12790

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 packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
mqttRubyGems	< 0.7.0	0.7.0

Affected products

Njh/Ruby MqttGHSA
Range: < 0.7.0

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

github.com/advisories/GHSA-9c5q-w6gr-fxcqghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2025-12790ghsaADVISORY
access.redhat.com/security/cve/CVE-2025-12790nvdWEB
bugzilla.redhat.com/show_bug.cginvdWEB
github.com/njh/ruby-mqtt/blob/main/NEWS.mdnvdWEB

News mentions

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cvss	0.481
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000