CVE-2026-10027: IBM Mq

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

IBM MQ could allow a remote attacker to cause a denial of service or execute arbitrary code due to a buffer overflow when processing malformed compressed data on channels configured with compression enabled.

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.