CVE-2026-58530
Summary
by MITRE • 07/14/2026
Heap-based buffer overflow in Windows Resilient File System (ReFS) 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 flaw within the Windows Resilient File System implementation that enables local code execution by unauthorized attackers. The issue stems from improper input validation and memory management practices within the ReFS file system driver components, specifically affecting how the system handles certain file operations and metadata processing. When malicious data is processed through ReFS operations, the vulnerability manifests as an overflow in heap-allocated memory regions, potentially allowing attackers to overwrite adjacent memory structures with crafted payloads.
The technical exploitation of this vulnerability leverages fundamental weaknesses in memory boundary checking mechanisms within the ReFS subsystem. Attackers can construct specially formatted files or trigger specific file system operations that cause the system to allocate insufficient memory for data processing while simultaneously writing beyond allocated buffer boundaries. This heap corruption creates opportunities for arbitrary code execution with the privileges of the compromised process, typically elevated system-level access when targeting kernel-mode components. The vulnerability aligns with CWE-121 heap-based buffer overflow patterns and represents a classic example of improper memory management that violates secure coding practices.
Operationally, this vulnerability poses significant risks to Windows systems running ReFS volumes, particularly in enterprise environments where file system stability and security are paramount. Local attackers who can access the system or have the ability to place malicious files on ReFS volumes can exploit this weakness to escalate privileges and potentially gain full system compromise. The impact extends beyond simple code execution as successful exploitation could lead to persistent backdoor installation, data exfiltration, or further lateral movement within network environments. Organizations utilizing ReFS for critical storage solutions face heightened risk profiles due to the difficulty in detecting such memory corruption attacks and the potential for complete system takeover.
Mitigation strategies should focus on immediate patch deployment through Microsoft security updates that address the specific buffer overflow conditions in ReFS implementations. System administrators must implement comprehensive monitoring for suspicious file operations and memory allocation patterns that could indicate exploitation attempts. Additional protective measures include restricting local user access to ReFS volumes where possible, implementing application whitelisting policies to prevent execution of unauthorized code, and deploying behavioral analysis tools capable of detecting anomalous heap manipulation patterns. The vulnerability demonstrates the importance of maintaining secure coding practices in kernel-mode drivers and highlights the necessity of regular security assessments for file system implementations. Organizations should also consider implementing principle of least privilege access controls and network segmentation to limit potential exploitation impact while awaiting official patches. This type of vulnerability typically requires immediate attention due to its local execution nature and the elevated privileges it can potentially grant to attackers, making proactive mitigation essential for maintaining system integrity and security posture.