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9.9

IBM MQ for HPE NonStop could crash or be hijacked

CVE-2026-10858 · published 24 days ago
Summary

Versions 8.1.0 to 8.1.0.40 of IBM MQ for HPE NonStop may let a logged‑in user cause the system to stop working or, in rare cases, run their own code because of a memory handling error when handling certain messages. This can disrupt business operations or expose data. Apply the latest IBM update that fixes the issue as soon as possible.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
ibm mq for hpe nonstop <= 8.1.0.40
Original advisory text
IBM MQ for HPE NonStop is vulnerable to a denial of service attack
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.9 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-122Heap-based Buffer Overflow
Timeline
Published18 Sep 2026
Updated11 Oct 2026
First seen18 Sep 2026
Sources
CVE-2026-10858 · NVD
CVE-2026-10858 · MITRE
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