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Vulnerabilities

Vulnerability · CVE-2025-12790

A flaw was found in Rubygem MQTT.

Published Nov 6, 2025 · catalog updated Feb 26, 2026 · Nicholas J Humfrey

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-12790. EPSS is 0.38%. Act only if a listed version of Nicholas J Humfrey is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.38%
Remediation
Version ranges on file
Affected products
vendor Nicholas J Humfrey ruby-mqtt 0 <0.7.0

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Nicholas J Humfrey ruby-mqtt 0 <0.7.00 <0.7.0

How to fix CVE-2025-12790

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-12790. EPSS is 0.38%. Act only if a listed version of Nicholas J Humfrey is installed.

Which versions are affected?

Compare what you have installed with Nicholas J Humfrey ruby-mqtt 0 <0.7.0 0 <0.7.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.38%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 6, 2025 · EUVD

    Detected

    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.

  2. Feb 26, 2026 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-12790

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-12790

    30-day exploitation probability 0.38%

    first.org
  • EUVDVulnerability recordEUVD-2025-38162

    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.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 2, 2026
  • CVE.orgOct 24, 2026
  • EUVDOct 24, 2026