CVE-2026-59136 in Windows
Summary
by MITRE • 08/11/2026
Use of uninitialized resource in Microsoft COM for Windows allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical security flaw in Microsoft COM (Component Object Model) for Windows systems where an unauthorized attacker can exploit uninitialized resources to gain local information disclosure capabilities. The issue stems from improper initialization of COM components that handle inter-process communication and object instantiation within the Windows operating system. When COM objects are created without proper resource initialization, they may contain residual data from previous operations or memory locations that have not been properly cleared. This creates a scenario where sensitive information potentially remains accessible through the uninitialized resources, allowing an attacker to extract confidential data from memory regions that should have been cleaned or secured.
The technical implementation of this vulnerability occurs within the COM infrastructure where objects are dynamically instantiated and managed across different process boundaries. When a COM object fails to properly initialize its internal resources, it may retain references to previously used memory locations or data structures that contain sensitive information such as cryptographic keys, user credentials, system configuration details, or application-specific data. This uninitialized state allows an attacker with local access to potentially read this residual information through various COM interfaces and method calls that interact with these improperly initialized components.
From an operational impact perspective, this vulnerability enables local privilege escalation scenarios where attackers can leverage the uninitialized resource access to gather intelligence about the target system. The disclosed information could include system configuration parameters, user session data, application state information, or other sensitive metadata that could be used for further exploitation attempts. The vulnerability is particularly concerning because it operates at a low-level system component that is fundamental to Windows functionality, making it difficult to detect and remediate without comprehensive system analysis.
The mitigation strategies for this vulnerability should focus on implementing proper resource initialization protocols within COM components and ensuring that all memory allocations are properly secured before being made available to applications. Microsoft typically addresses such issues through security updates that enforce proper initialization of COM objects and implement additional memory protection mechanisms. Organizations should also consider implementing runtime monitoring solutions that can detect anomalous access patterns to uninitialized resources and apply principle of least privilege configurations to limit potential exploitation avenues.
This vulnerability type aligns with CWE-457: Use of Uninitialized Variable, which specifically addresses situations where variables or resources are used without proper initialization. The attack pattern corresponds to techniques described in the MITRE ATT&CK framework under T1005: Data from Local System and T1059: Command and Scripting Interpreter, where attackers leverage system-level vulnerabilities to extract sensitive information. The remediation approach should include comprehensive code review processes for COM component implementations, memory management best practices, and regular security assessments to identify similar uninitialized resource scenarios across the system architecture. Organizations should also implement proper access controls and monitoring mechanisms to prevent unauthorized local access that could enable exploitation of such vulnerabilities.