CVE-2026-10858: IBM Mq For HPE Nonstop

Critical severity, CVSS 9.9. EPSS: 0.4% chance of exploitation in the next 30 days.

IBM MQ for HPE NonStop 8.1.0 through 8.1.0.40 could allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code due to a heap buffer underflow when processing multi-segment messages.

Affected products

• IBM Mq For HPE Nonstop: from 8.1.0, up to and including 8.1.0.40

Published 2026-09-18. Last modified 2026-09-19.