CVE-2026-108460 in Windows
Summary
by MITRE • 10/14/2026
Use after free in Windows Message Queuing allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described involves a critical use-after-free error within the Microsoft Message Queuing service, commonly known as MSMQ or MSMQ. This component is responsible for facilitating communication between applications across different systems by allowing them to send and receive messages asynchronously. The flaw arises when the application continues to access memory that has already been deallocated or freed by the system. In this specific context, an attacker can exploit this timing discrepancy to manipulate how the service handles networked message data. By crafting a specially designed packet or sequence of operations, the unauthorized actor triggers the use-after-free condition, leading to arbitrary code execution with the privileges of the local process running MSMQ.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous because they allow an attacker to control memory contents after the original owner has released them. If the freed memory is reallocated for another purpose before being accessed again, or if it remains accessible in a way that allows data injection, the attacker can overwrite critical pointers or function addresses within the process space. This manipulation enables the execution of arbitrary shellcode on the target system. Since MSMQ operates as a network-facing service by default on many Windows configurations, this vulnerability presents a significant remote attack vector. An unauthenticated, remote attacker located anywhere on the same network segment or accessible via the internet can initiate the exploit without needing prior credentials or user interaction.
The operational impact of successfully exploiting this flaw is severe and comprehensive. The resulting code execution occurs within the context of the service account running MSMQ, which typically possesses elevated privileges depending on the system configuration. This allows the attacker to install programs, view, change, or delete data, create new accounts with full user rights, or even completely compromise the underlying operating system. In enterprise environments where message queuing is used for critical business logic and inter-service communication, such a breach can lead to widespread lateral movement, data exfiltration, and disruption of essential services. The ability to execute code remotely makes this vulnerability a high-priority target for automated scanning tools and advanced persistent threat actors seeking initial access points within Windows-based infrastructures.
This type of memory corruption flaw is classified under CWE-416, which defines use after free as accessing or using pointers that point to memory that has already been freed. In the context of the MITRE ATT&CK framework, this vulnerability facilitates techniques associated with Initial Access and Execution, specifically leveraging services for code execution. Attackers often utilize such vulnerabilities in conjunction with other tactics to establish a foothold within a network perimeter. The lack of authentication requirements further aligns with common attack patterns where adversaries exploit publicly accessible services that have not been properly patched or configured securely.
Mitigation strategies must focus on both immediate remediation and long-term security hardening. The primary defense is the timely application of vendor-supplied patches released by Microsoft to address this specific memory corruption issue in MSMQ. Organizations should prioritize patching all systems where MSMQ is installed, particularly those exposed to untrusted networks. Additionally, if MSMQ functionality is not required for business operations, it is advisable to disable or uninstall the service entirely to reduce the attack surface. Network-level controls such as firewalls and intrusion detection systems can also be configured to block suspicious traffic patterns associated with exploiting this vulnerability, although patching remains the most effective countermeasure. Regular security assessments and monitoring for anomalous behavior in message queue services are recommended to detect potential exploitation attempts early.