CVE-2026-50482 in Windows
Summary
by MITRE • 07/14/2026
Heap-based buffer overflow in Windows NTFS allows an authorized 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 flaw within the Windows NTFS file system implementation that enables local privilege escalation through unauthorized code execution. The technical nature of this vulnerability stems from improper memory management practices during NTFS file operations, specifically when handling user-supplied data structures within heap-allocated memory regions. The flaw occurs when the operating system fails to properly validate input lengths or bounds checking during file system operations, allowing an attacker with legitimate user credentials to craft malicious input that overflows allocated heap buffers.
The operational impact of this vulnerability extends beyond simple local execution as it provides a pathway for attackers to escalate privileges from standard user accounts to SYSTEM level access. This occurs because the buffer overflow allows arbitrary code placement within the heap memory space, potentially enabling attackers to overwrite critical function pointers or return addresses in the call stack. The vulnerability is particularly dangerous in enterprise environments where users may have legitimate access to file systems but lack administrative privileges, as demonstrated by the attack pattern that requires only authorized user authentication. This aligns with the common attack technique described in the ATT&CK framework under privilege escalation tactics and techniques, specifically leveraging memory corruption vulnerabilities for elevated access.
From a security standards perspective, this vulnerability maps directly to CWE-121 Heap-based Buffer Overflow, which is classified as a fundamental memory safety issue where data is written beyond the boundaries of heap-allocated buffers. The flaw exhibits characteristics consistent with the Common Weakness Enumeration's categorization of heap corruption vulnerabilities, particularly those that occur during file system operations and involve untrusted input processing. The vulnerability also demonstrates aspects of CWE-787 Out-of-bounds Write, as it involves writing data beyond the allocated buffer boundaries in heap memory structures.
The mitigation strategies for this vulnerability require immediate patching through Microsoft's security updates, which typically address the underlying memory management issues by implementing proper bounds checking and input validation. Organizations should also implement additional defensive measures such as heap metadata protection, address space layout randomization, and data execution prevention mechanisms to reduce exploitability. Network segmentation and principle of least privilege access controls can help limit potential exploitation scope even if the vulnerability is present in the environment. The ATT&CK framework recommends monitoring for suspicious file system activities and implementing behavioral analytics that can detect anomalous heap memory operations indicative of buffer overflow exploitation attempts.
The broader implications of this vulnerability highlight the importance of robust memory management practices in operating system kernel components, particularly within file system implementations where memory corruption can lead to complete system compromise. This type of vulnerability demonstrates the critical need for comprehensive security testing and code review processes specifically targeting memory safety issues in core operating system components. Regular vulnerability assessments and penetration testing focused on heap memory operations should be conducted to identify similar weaknesses in other system components, as these types of vulnerabilities often indicate broader architectural security gaps that require systematic remediation approaches.