CVE-2026-49796 in Windows
Summary
by MITRE • 07/14/2026
Heap-based buffer overflow in Windows GDI+ allows an unauthorized attacker to execute code locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical heap-based buffer overflow within the Windows Graphics Device Interface Plus component that enables local privilege escalation through arbitrary code execution. The flaw occurs when GDI+ processes malformed graphics data structures, specifically during memory allocation and manipulation operations in the graphics rendering pipeline. Attackers can exploit this weakness by crafting specially designed image files or graphics commands that trigger the vulnerable code path, leading to memory corruption that can be leveraged for remote code execution. The vulnerability stems from insufficient input validation and bounds checking within GDI+ memory management functions, creating opportunities for attackers to overwrite adjacent memory locations with malicious payloads.
The technical implementation of this exploit involves manipulating heap metadata and memory pointers to achieve code execution control. When GDI+ processes graphics objects containing malformed data, the system allocates memory blocks that do not properly account for input boundaries, resulting in buffer overflows that can be manipulated to redirect program execution flow. This type of vulnerability aligns with CWE-121 heap-based buffer overflow classification and maps to attack techniques documented in the MITRE ATT&CK framework under T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation. The vulnerability affects multiple Windows operating systems including windows 7 through windows 10, with varying degrees of exploitability based on system security configurations such as ASLR and DEP protections.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise when combined with other attack vectors. Local attackers can leverage this flaw to elevate privileges from standard user accounts to SYSTEM level access, effectively gaining complete control over affected systems. The vulnerability's exploitation requires minimal user interaction in local contexts, making it particularly dangerous in enterprise environments where users may have access to graphics processing capabilities through legitimate software applications. Organizations running affected Windows versions face significant risk of persistent malware installation and data exfiltration when this vulnerability remains unpatched. Security professionals must consider the potential for lateral movement within networks if exploited systems are not properly isolated.
Mitigation strategies should prioritize immediate patch deployment from Microsoft security updates, which address the underlying memory handling issues in GDI+ components. System administrators should implement additional protective measures such as disabling unnecessary graphics processing capabilities and restricting user access to potentially vulnerable applications. Process isolation techniques including AppContainer restrictions for graphics applications can limit exploitation potential even when vulnerabilities exist. Network segmentation and monitoring solutions should be enhanced to detect anomalous graphics processing activities that might indicate exploitation attempts. Regular security assessments focusing on heap memory handling in graphics libraries should be conducted alongside vulnerability scanning procedures to identify similar weaknesses in custom applications or third-party software components. The vulnerability demonstrates the importance of secure coding practices in graphics processing libraries and highlights the necessity for comprehensive input validation mechanisms in system-level components.