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CVE-2026-65662 is a medium-severity vulnerability in the Windows Graphics Device Interface (GDI) component. The flaw resides in an out-of-bounds read operation that allows an authenticated attacker to disclose sensitive information locally.
The Windows GDI subsystem is responsible for graphical output to displays and printers, handling the rendering of images, fonts, and user interface elements. The vulnerability stems from improper bounds checking when GDI processes certain graphical objects or specially crafted data structures. When a local attacker with valid credentials executes a malicious application or script, they can trigger this out-of-bounds read condition. During the out-of-bounds read, the GDI component reads memory beyond the allocated buffer boundaries, potentially exposing adjacent kernel-mode or user-mode memory contents. This leaked memory may contain sensitive data such as cryptographic keys, password hashes, user credentials, or other confidential information from other processes or the operating system kernel itself.
According to the CVSS v3.1 vector string provided by Microsoft (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N), the attack requires local access (AV:L), is of low complexity (AC:L), and requires low privileges (PR:L). No user interaction is needed (UI:N). The scope is unchanged (S:U), with high impact on confidentiality (C:H) but none on integrity or availability. This combination yields a base score of 5.5, MEDIUM severity.
The vulnerability affects multiple versions of Windows, including Windows 10 1607 (up to version 10.0.14393.9418) and Windows 10 1809 (up to version 10.0.17763.9115), among other impacted configurations. Microsoft has published a vendor advisory through the MSRC update guide. The weakness is classified under CWE-125: Out-of-bounds Read.
DailyCVE Form:
Platform: Windows GDI
Version: 10 1607/1809+
Vulnerability: Out-of-bounds Read
Severity: 5.5 MEDIUM
date: 08/11/2026
Prediction: 09/08/2026
What Undercode Say:
Check if system is vulnerable (Windows 10 1607 before 10.0.14393.9418) wmic os get version Query installed updates related to GDI wmic qfe list brief | findstr "GDI" Monitor for potential exploitation attempts via Event Logs wevtutil qe System /c:10 /f:text /q:"[System[Provider[@Name='Microsoft-Windows-Win32k']]]"
Exploit: (Educational Purposes!)
A local attacker with low privileges can craft a malicious executable that leverages the GDI out-of-bounds read. The attacker calls GDI functions with malformed parameters or specially crafted graphical objects. Upon processing, the vulnerable GDI code reads adjacent memory contents without proper boundary validation. The attacker then captures the leaked memory data and parses it to extract sensitive information such as kernel pointers, user credentials, or other process memory. Proof-of-concept code typically involves manipulating bitmap objects or EMF (Enhanced Metafile) records to trigger the memory read beyond the allocated buffer.
Protection:
- Apply the security update from Microsoft as soon as it becomes available
- Restrict local access to systems and enforce least-privilege user accounts
- Enable Windows Defender and keep antivirus definitions updated
- Monitor for suspicious processes that interact heavily with GDI subsystem
- Consider application whitelisting to prevent untrusted executables from running
- Regularly audit user accounts and remove unnecessary privileges
Impact:
Successful exploitation allows an attacker with local access and low privileges to read sensitive memory contents from the operating system or other processes. This information disclosure can lead to further privilege escalation or lateral movement within the organization. The confidentiality impact is rated HIGH per the CVSS score. While integrity and availability are not directly affected, the leaked information may serve as a stepping stone for more severe attacks. All Windows versions running the affected GDI component are potentially at risk until the patch is applied.
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Sources:
Reported By: nvd.nist.gov
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