CVE-2026-12667: IBM Mq

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 could allow an authenticated attacker to read files from a vulnerable .NET client or cause limited denial of service due to improper handling of XML external entities in RFH2 folder parsing.

Affected products

• IBM Mq: from 9.1.0.0, up to and including 9.1.0.37 LTS; from 9.2.0.0, up to and including 9.2.0.43 LTS; from 9.3.0.0, up to and including 9.3.0.41 LTS; from 9.3.0.0, up to and including 9.3.5.1 CD; from 9.4.0.0, up to and including 9.4.0.25 LTS; from 9.4.0.0, up to and including 9.4.5.1 CD; …

Published 2026-09-15. Last modified 2026-09-16.