CVE-2026-11728: IBM Mq

High severity, CVSS 8.1. EPSS: 0.4% 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 a remote attacker to cause a denial of service or potentially execute arbitrary code in the client due to a heap buffer overflow when receiving messages from a malicious queue manager or through a man-in-the-middle attack.

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.