CVE-2026-11716 in MQ for HPE NonStop
Summary
by MITRE • 09/18/2026
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 during queue manager startup due to improper validation of cluster migration data.
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Analysis
by VulDB Data Team • 09/18/2026
The vulnerability identified in IBM MQ for HPE NonStop versions 8.1.0 through 8.1.0.40 represents a critical security flaw rooted in the insufficient validation mechanisms applied to cluster migration data during the queue manager startup process. This defect allows an authenticated attacker, who possesses valid credentials within the system environment, to manipulate specific input parameters associated with the clustering configuration. By crafting maliciously formatted or logically inconsistent migration data structures, the attacker can exploit this lack of rigorous boundary and type checking. The core technical failure lies in the application's assumption that incoming cluster state information is trustworthy and correctly structured before it is processed by internal logic handlers responsible for initializing the queue manager environment.
From a technical perspective, this flaw falls under the category of improper input validation, specifically categorized as CWE-20: Improper Input Validation within standard security taxonomies. The vulnerability manifests when the queue manager attempts to reconstruct its operational state from migrated cluster data. Because the system fails to adequately sanitize or verify the integrity and format of these inputs prior to execution, it becomes susceptible to memory corruption errors such as buffer overflows or heap-based exploits if the malformed data exceeds expected bounds. Alternatively, in scenarios where logic flow is altered by invalid parameters, the attacker may achieve arbitrary code execution by redirecting control flow to malicious payloads embedded within the crafted migration data. This aligns with ATT&CK technique T1059: Command and Scripting Interpreter or potentially T1203: Exploitation for Client Execution depending on how the initial foothold is leveraged post-exploitation, although the primary vector here is local privilege escalation via service initialization routines.
The operational impact of this vulnerability is severe due to its potential dual nature affecting both availability and confidentiality through integrity compromise. If exploited successfully during queue manager startup, the immediate consequence can be a denial of service condition where the messaging infrastructure fails to initialize correctly, leading to system crashes or indefinite hangs that disrupt business-critical message routing operations. More critically, if the vulnerability allows for arbitrary code execution, an authenticated attacker could gain elevated privileges on the host operating system. This would enable them to exfiltrate sensitive data stored within queues, modify transactional integrity by injecting fraudulent messages, or use the compromised queue manager as a pivot point for further lateral movement across the network infrastructure. Given that IBM MQ is often central to enterprise integration architectures, such a breach could have cascading effects on downstream systems relying on reliable message delivery and security boundaries defined at this layer.
Mitigation strategies must prioritize immediate patching of all affected instances running versions 8.1.0 through 8.1.0.40 to the latest fixed release provided by IBM. In environments where immediate patching is not feasible, administrators should enforce strict access controls ensuring that only highly trusted administrative accounts have permissions to modify cluster configuration files or initiate migration processes. Additionally, implementing network segmentation to restrict direct access to queue manager startup interfaces and monitoring logs for unusual patterns in authentication events during system initialization can provide early detection capabilities. Security teams should also review the principle of least privilege applied to service accounts running IBM MQ services to minimize the potential impact if an attacker manages to exploit this flaw despite preventive controls. Regular audits of configuration management practices regarding cluster migration data integrity will further reduce the attack surface associated with this specific vulnerability vector.