CVE-2026-10858 IBM MQ for HPE NonStop is vulnerable to a denial of service attack
An authenticated attacker can cause denial of service or execute arbitrary code via heap buffer underflow in IBM MQ for HPE NonStop.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-10858?
CVE-2026-10858 is a critical memory corruption vulnerability in IBM MQ for HPE NonStop, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-122
Which versions are affected by CVE-2026-10858?
How do I fix CVE-2026-10858?
No fix has been published for CVE-2026-10858 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-10858 being exploited?
There is no known exploitation of CVE-2026-10858 in the wild and no public exploit code.
Sources
Also known as GHSA-cmx7-5fpv-xc6x.