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CVE-2025-12790— Rubygem-mqtt: rubygem-mqtt hostname validation

Quick assessment

Affected
Nicholas J Humfrey ruby-mqtt
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MQTT（Message Queuing Telemetry Transport,消息队列遥测传输）是一个ISO 标准（ISO/IEC PRF 20922）下基于发布 (Publish)/订阅 (Subscribe)范式的消息协议，它工作在TCP/IP协议族上，是为硬件性能低下的远程设备以及网络状况不好的情况下而设计的发布/订阅型消息协议。 MQTT存在安全漏洞，该漏洞源于默认情况下缺少主机名验证，可能导致中间人攻击。

CVSS 7.4 · High EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2025-12790

Vulnerability Information
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Vulnerability Title
Rubygem-mqtt: rubygem-mqtt hostname validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
路径遍历：’..filename’
Source: CVE Program / CVE List V5
Vulnerability Title
MQTT 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MQTT（Message Queuing Telemetry Transport,消息队列遥测传输）是一个ISO 标准（ISO/IEC PRF 20922）下基于发布 (Publish)/订阅 (Subscribe)范式的消息协议，它工作在TCP/IP协议族上，是为硬件性能低下的远程设备以及网络状况不好的情况下而设计的发布/订阅型消息协议。 MQTT存在安全漏洞，该漏洞源于默认情况下缺少主机名验证，可能导致中间人攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Nicholas J Humfrey ruby-mqtt 0 ~ 0.7.0 -
Red Hat Red Hat Satellite 6 - cpe:/a:redhat:satellite:6
Red Hat Red Hat Satellite 6 - cpe:/a:redhat:satellite:6

II. Public POCs for CVE-2025-12790

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8213 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2025-12790

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Vendor Advisories for CVE-2025-12790 (1)

IV. Related Vulnerabilities

Same weakness: CWE-29

V. Comments for CVE-2025-12790

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