CVE-2026-50375 in Windows
Summary
by MITRE • 07/14/2026
Heap-based buffer overflow in Windows DirectX allows an authorized attacker to elevate privileges locally.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical heap-based buffer overflow within the Windows DirectX subsystem that enables local privilege escalation for authenticated attackers. The flaw exists in how DirectX handles memory allocation and data processing, specifically when managing heap structures during graphics rendering operations. Attackers with valid user credentials can exploit this weakness to manipulate heap metadata and overwrite adjacent memory regions, ultimately gaining elevated privileges on the target system.
The technical implementation of this vulnerability stems from inadequate bounds checking within DirectX's memory management functions. When processing graphics commands or data structures, the subsystem fails to properly validate input sizes before allocating heap memory, creating opportunities for attackers to overflow allocated buffers. This heap corruption can be leveraged to overwrite function pointers, return addresses, or other critical metadata within the heap allocator's control structures. The vulnerability is classified under CWE-121 heap-based buffer overflow, which is a well-documented weakness in memory safety mechanisms.
From an operational perspective, this vulnerability presents a significant threat to Windows environments as it requires only local authentication to exploit successfully. The attack vector typically involves crafting malicious DirectX graphics commands or rendering operations that trigger the vulnerable code path. Once successful, the attacker can execute arbitrary code with system-level privileges, potentially leading to complete system compromise. This makes the vulnerability particularly dangerous in enterprise environments where local access might be obtained through various legitimate means such as user accounts, service accounts, or compromised endpoints.
The impact of this vulnerability extends beyond simple privilege escalation to encompass potential data exfiltration, persistence mechanisms, and further lateral movement within networks. Attackers can leverage elevated privileges to access sensitive system files, modify registry entries, install backdoors, or establish persistent access to compromised systems. The ATT&CK framework categorizes this type of vulnerability exploitation under privilege escalation techniques, specifically targeting the use of software vulnerabilities to gain higher-level system permissions. Organizations should implement immediate mitigations including applying security patches from Microsoft, implementing least privilege principles, and monitoring for suspicious DirectX-related activities in system logs.
Mitigation strategies should include maintaining up-to-date Windows systems with the latest security patches that address this specific heap overflow vulnerability. Network segmentation and access controls can limit the potential impact of successful exploitation attempts. Additionally, implementing application whitelisting policies to restrict unauthorized DirectX-based applications from executing on critical systems provides an additional layer of defense. Security monitoring solutions should be configured to detect anomalous DirectX memory allocation patterns or unexpected privilege elevation events that could indicate exploitation attempts against this vulnerability.