Headline
GHSA-9c5q-w6gr-fxcq: MQTT does not validate hostnames
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.
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- GitHub Advisory Database
- GitHub Reviewed
- CVE-2025-12790
MQTT does not validate hostnames
High severity GitHub Reviewed Published Nov 6, 2025 to the GitHub Advisory Database • Updated Nov 6, 2025
Package
Affected versions
< 0.7.0
Description
Published to the GitHub Advisory Database
Nov 6, 2025
EPSS score