CVE-2026-69459 in Windows
Summary
by MITRE • 09/09/2026
Heap-based buffer overflow in Windows Power Dependency Coordinator allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified involves a heap-based buffer overflow within the Windows Power Dependency Coordinator service, a critical component of the operating system responsible for managing power state transitions and dependencies between hardware devices and software processes. This specific flaw arises from improper memory management practices during the handling of input data or internal structures related to power dependency events. When an authorized attacker interacts with this subsystem, they can supply crafted inputs that exceed the allocated buffer size on the heap. Because the system fails to adequately validate the length of these inputs before copying them into fixed-size buffers, excess data overwrites adjacent memory regions. This corruption allows for arbitrary code execution within the context of the affected process, which typically runs with high privileges due to its role in core system operations.
From a technical perspective, heap-based buffer overflows are particularly dangerous because they can be exploited to manipulate function pointers or object headers stored on the heap, leading to control flow hijacking. In this scenario, an attacker who has already gained local access and possesses valid credentials can leverage this flaw to escalate privileges from their current user context to that of SYSTEM or other highly privileged accounts. The exploitation does not require physical access or remote network interaction, classifying it as a local privilege escalation vector. This aligns with the Common Weakness Enumeration standard under CWE-122, which describes heap-based buffer overflows where data is written beyond the bounds of a dynamically allocated memory block on the heap.
The operational impact of this vulnerability is severe for any environment relying on Windows operating systems where multiple user accounts exist or where local access can be obtained through social engineering, phishing, or other initial compromise techniques. Once an attacker achieves privilege escalation via this flaw, they gain unrestricted control over the system. This includes the ability to install programs, view, change, or delete confidential data, and create new administrative accounts with full privileges. The compromised system becomes a pivot point for further lateral movement within a network, potentially leading to widespread data exfiltration or disruption of critical services.
This vulnerability is categorized under MITRE ATT&CK technique T1068, which covers Exploitation for Privilege Escalation. Specifically, it falls into the sub-technique involving exploitation of software vulnerabilities rather than misconfigurations. The attack vector requires local access and authentication, meaning that while the impact is high, the initial barrier to entry involves obtaining a foothold on the target machine through other means such as malware infection or credential theft. Defenders must recognize that even authenticated users pose a significant risk if system components contain unchecked memory handling flaws.
Mitigation strategies primarily involve applying vendor-supplied security patches and updates released by Microsoft to address the underlying code defect in the Power Dependency Coordinator service. Organizations should prioritize patching systems where local user accounts have elevated permissions or where shared workstations are common, as these environments increase the likelihood of an attacker achieving initial access. Additionally, implementing strict application whitelisting policies can prevent unauthorized executables from running even if privilege escalation is attempted. Regular auditing of system logs for unusual process creation events associated with power management services may also aid in detecting exploitation attempts before full compromise occurs. Maintaining up-to-date antivirus and endpoint detection solutions that monitor for heap corruption anomalies provides an additional layer of defense against such memory corruption exploits.