CVE-2026-11378: IBM Mq

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

IBM MQ could allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code due to an integer overflow in distribution list processing.

Affected products

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

Published 2026-09-18. Last modified 2026-09-23.