CVE-2025-12790

Rubygem-mqtt: rubygem-mqtt hostname validation

HIGH
7.4
CVSS Score
Published: November 6, 2025 at 09:07 PM UTC
Updated: October 18, 2026 at 09:10 PM UTC
2 products affected across 2 vendorsSatelliteRuby Mqtt

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Severity
HIGH7.4
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0 ≤ v < 0.7.00
Affected range stops below 0.7.0, so it looks safe — our inference, not a vendor statement
All versions6

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHredhat
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-29

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