CVE-2026-10747 in MQ Appliance
Summary
by MITRE • 09/18/2026
IBM MQ Appliance could allow a remote attacker to cause a denial of service or potentially execute arbitrary code due to a heap buffer overflow in protocol message processing before authentication.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 09/18/2026
The vulnerability identified in IBM MQ Appliance represents a critical security flaw rooted in improper memory management during the handling of incoming network protocols. Specifically, this is a heap-based buffer overflow that occurs within the application layer when processing messages prior to the completion of user authentication. This pre-authentication state is particularly dangerous because it allows unauthenticated remote attackers to interact directly with the core message queueing logic without needing valid credentials. The flaw stems from insufficient validation of input data lengths or structures against allocated memory buffers, leading to a situation where an attacker can write beyond the boundaries of the intended buffer into adjacent heap memory regions.
From a technical perspective, this type of vulnerability falls under CWE-122, which describes a heap-based buffer overflow. In the context of IBM MQ Appliance, the protocol message processing engine likely fails to properly check the size of incoming data packets or malformed messages against the pre-allocated space on the heap. When an attacker crafts a specially designed packet with oversized fields or specific control structures, they can overwrite adjacent memory metadata or function pointers stored in the heap structure. This corruption disrupts the normal flow of program execution and can lead to arbitrary code execution if the overwritten data includes critical pointers that are later dereferenced by the application logic.
The operational impact of this vulnerability is severe due to its remote nature and lack of authentication requirements. An attacker located anywhere on the network, or even over the internet depending on exposure configuration, can exploit this flaw to cause a denial of service by crashing the MQ Appliance process through memory corruption that triggers an exception or segmentation fault. More critically, if the heap layout allows for precise control over overwritten data, the vulnerability enables remote code execution with the privileges of the IBM MQ service account. This could allow the attacker to gain full control over the underlying operating system, pivot to other systems within the network, exfiltrate sensitive message queue data, or establish persistent backdoors.
This attack vector aligns closely with MITRE ATT&CK techniques related to initial access and execution via exploited vulnerabilities. Specifically, it relates to T1190, Exploit Public-Facing Application, as the vulnerability exists in a service exposed to network traffic before authentication checks are enforced. The lack of pre-authentication validation means that standard security controls like firewalls or intrusion detection systems may not effectively mitigate this threat unless they perform deep packet inspection capable of identifying malformed protocol structures indicative of heap overflow attempts.
Mitigation strategies must focus on immediate patching and architectural hardening. IBM has likely released a fix for the specific version of MQ Appliance affected, so applying the latest security patches is the primary remediation step. In environments where patching cannot be performed immediately, network segmentation should be enforced to restrict access to the MQ appliance management interfaces and message ports only from trusted subnets or jump hosts. Additionally, deploying intrusion prevention systems with signatures for known buffer overflow exploits can provide a layer of defense against automated attacks targeting this specific flaw. Regular auditing of protocol implementations to ensure strict input validation and bounds checking is essential to prevent similar heap-based vulnerabilities in the future.