IBM MQ <=8.1.0.40 HPE NonStop Heap Underflow: Auth'd DoS/Exec
CVE-2026-10858 Published on September 18, 2026
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.
Vulnerability Analysis
CVE-2026-10858 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-10858
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Affected Versions
IBM MQ for HPE NonStop:- Version 8.1.0, <= 8.1.0.40 is affected.