Vulnerability · Published Nov 6, 2025 · Assigned by redhat
CVE-2025-12790Rubygem-mqtt: rubygem-mqtt hostname validation
High 7.4
In plain English
A high-severity security flaw in ruby-mqtt from Nicholas J Humfrey. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.4High
Exploit odds (30 days)0.4%top 68.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| RubyGems | mqtt | 0.7.0 | GHSA-9c5q-w6gr-fxcq |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Nicholas J Humfrey | ruby-mqtt | 0 – before 0.7.0 |
| Red Hat | Red Hat Satellite 6 | see references |
| Red Hat | Red Hat Satellite 6 | see references |
Weakness: CWE-29 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://access.redhat.com/security/cve/CVE-2025-12790 vdb-entry, x_refsource_REDHAT
- RHBZ#2413004 issue-tracking, x_refsource_REDHAT
- https://github.com/njh/ruby-mqtt/blob/main/NEWS.md#ruby-mqtt-version-070-2025-10-29