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CVE-2025-12790

Rubygem-mqtt: rubygem-mqtt hostname validation

Published: Nov 6, 2025Updated: Nov 12, 2025 Sources: CVE List NVD GHSA BDUCWE-29
NVD MITRE
7.4CVSSHIGH
EPSS Score
0.3%
Top 77.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-29

Affected Products

ruby-mqttNicholas J Humfrey
Library
OSS Libraries / generic-library
Red Hat Satellite 6Red Hat
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Rubygem-mqttNicholas Humfrey
Library
OSS Libraries / rubygems
mqttRubyGemsOSS Libraries
nicholas j humfreyindividual-devOSS Libraries
red hatcommercialUSOperating Systemsaka red hat
ооо «ред софт»commercialRUOperating Systemsaka red soft
nicholas humfreyoss-projectOSS Librariesaka rubygem-mqtt, rubygem mqtt
rubygemspackage-ecosystemOSS Libraries

Exploitability

Official Patch Available
Workaround Available

References

https://access.redhat.com/security/cve/CVE-2025-12790
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2413004
bugzilla.redhat.com
https://github.com/njh/ruby-mqtt/blob/main/NEWS.md#ruby-mqtt-version-070-2025-10-29
github.com
and 3 more references View all →

Timeline

Published
Nov 6, 2025
Last Updated
Nov 12, 2025

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