CVE-2026-65662 in Windows
Summary
by MITRE • 08/11/2026
Out-of-bounds read in Windows GDI allows an authorized attacker to disclose information locally.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 08/12/2026
This vulnerability represents a critical out-of-bounds read flaw within the Windows Graphics Device Interface component that enables authenticated local attackers to extract sensitive information from system memory. The issue stems from inadequate input validation and boundary checking mechanisms within the GDI subsystem, which processes graphical operations and rendering tasks across the Windows operating system. When malicious code attempts to manipulate graphics objects or render operations through GDI functions, the flawed implementation fails to properly validate array indices or buffer boundaries, leading to unauthorized memory access patterns that can expose confidential data.
The technical exploitation of this vulnerability occurs when an attacker with local user privileges crafts specific graphical operations that trigger the out-of-bounds memory read condition. This typically involves manipulating graphics rendering parameters or object handles in ways that cause the GDI driver to access memory locations beyond allocated buffers. The flaw manifests through various attack vectors including DirectDraw, GDI+ operations, and other graphics processing functions that rely on the vulnerable component. According to CWE classification, this vulnerability maps directly to CWE-125: "Out-of-bounds Read" which represents a fundamental memory safety issue where programs access memory locations beyond valid buffer boundaries.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can potentially expose sensitive system data including cryptographic keys, user credentials, or other confidential information stored in adjacent memory regions. Attackers can leverage this weakness to perform reconnaissance activities and gather intelligence that might facilitate further exploitation attempts. The local privilege requirement means that attackers must first establish a foothold on the target system through legitimate user access or other initial compromise techniques before utilizing this specific vulnerability. This characteristic aligns with ATT&CK technique T1068: "Local Privilege Escalation" and T1082: "System Information Discovery" where adversaries seek to understand system configurations and extract valuable data.
Mitigation strategies for this vulnerability require immediate patch application from Microsoft as part of the regular security update cycle, particularly addressing the specific GDI subsystem components. System administrators should implement comprehensive monitoring of graphics-related processes and API calls that might indicate exploitation attempts. The principle of least privilege should be enforced to limit local user access rights where possible, reducing the attack surface for potential exploitation. Additionally, memory protection mechanisms including address space layout randomization and data execution prevention should be enabled to complicate exploitation attempts. Organizations should also consider implementing application whitelisting policies that restrict execution of unauthorized graphics processing applications that might be used to trigger this vulnerability. Regular security assessments of graphical subsystems and thorough code reviews of graphics-related components can help identify similar memory safety issues before they can be exploited by malicious actors.