CVE-2026-105725 in Windows
Summary
by MITRE • 10/14/2026
Use after free in Windows Security App allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described involves a use-after-free condition within the Windows Security application, a core component of Microsoft's operating system responsible for managing security settings and threat protection mechanisms. This specific flaw arises from improper memory management practices where the application continues to reference a block of memory after it has been freed or deallocated by the system. In complex software architectures like those found in modern Windows environments, such errors can lead to unpredictable behavior, including crashes, data corruption, or, more critically, arbitrary code execution. The presence of this vulnerability indicates that the internal logic governing resource lifecycle management within the security app fails to properly nullify pointers or validate memory states before subsequent access operations are performed.
From a technical perspective, use-after-free vulnerabilities exploit the gap between when memory is released and when references to that memory are cleared. An attacker who has already gained local access to the system can craft specific inputs or trigger specific sequences of events within the Windows Security application to force the premature freeing of an object while retaining a reference to it. By carefully controlling the contents of the freed memory region, which may be reallocated for other purposes by the operating system, the attacker can manipulate the data that is subsequently read through the dangling pointer. This manipulation allows the attacker to influence control flow or overwrite critical structures in memory, effectively bypassing standard security controls and executing code with elevated privileges.
The operational impact of this vulnerability is significant due to its potential for local privilege escalation. Since the Windows Security application typically runs with high-level system permissions to monitor and protect against threats, successfully exploiting a use-after-free flaw within it grants an attacker access to these same elevated rights. This means that even if an adversary only has limited user privileges on a compromised machine, they can leverage this defect to gain administrative or SYSTEM-level access. Such escalation compromises the integrity of the entire system, allowing for unrestricted installation of malware, modification of security policies, exfiltration of sensitive data, and persistence mechanisms that are difficult to detect and remove.
This type of vulnerability is commonly categorized under CWE-416, which defines use after free as a class of software errors where a pointer refers to memory that has already been freed. In the context of attack frameworks like MITRE ATT&CK, this exploitation technique aligns with techniques related to privilege escalation and defense evasion, specifically those involving local exploits for persistence or elevation of privileges. The ability to execute arbitrary code in the context of a trusted system process makes it particularly dangerous as security tools may not flag the malicious activity originating from such a legitimate-looking source.
Mitigation strategies primarily involve applying vendor-supplied patches that address the underlying memory management errors within the Windows Security application. Organizations should ensure that all systems are updated with the latest cumulative updates and security fixes provided by Microsoft, which typically include corrections for known vulnerabilities in core system components. Additionally, implementing strict access controls can limit the potential impact; ensuring that only authorized users have local login capabilities reduces the attack surface available to an adversary attempting to exploit this flaw. Deploying endpoint detection and response solutions with behavioral analysis capabilities may also help identify anomalous activities resulting from such exploitation attempts, providing an additional layer of defense against privilege escalation attacks.