CVE-2026-97813 in Windows
Summary
by MITRE • 10/15/2026
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability described involves a heap-based buffer overflow within the Microsoft Windows Hyper-V component, which presents a significant risk to system integrity and data confidentiality. Heap-based buffer overflows occur when a program writes more data to a dynamically allocated memory block on the heap than it was intended to hold. This specific flaw allows an authorized attacker who has network access to exploit this memory corruption issue by sending specially crafted requests or packets that trigger the overflow condition. The exploitation of such vulnerabilities typically relies on precise control over memory layout and execution flow, making them sophisticated attacks that require careful preparation but can yield severe consequences if successful.
From a technical perspective, the core flaw lies in the improper validation of input data before it is copied into a fixed-size buffer allocated on the heap. When an attacker provides oversized or malformed input, the excess data overwrites adjacent memory structures, potentially corrupting critical metadata such as allocation headers or function pointers. This corruption can lead to arbitrary code execution or, more commonly in this context, information disclosure. By carefully crafting the overflow payload, an attacker may be able to read sensitive kernel-mode data from the host system's memory space, bypassing standard isolation boundaries that Hyper-V is designed to enforce between virtual machines and the hypervisor itself.
The operational impact of this vulnerability centers on unauthorized access to confidential information residing within the Windows operating environment. Since the attack vector requires network connectivity and authorized authentication, it poses a targeted threat rather than a widespread remote exploit scenario. However, for organizations relying heavily on Hyper-V for critical infrastructure or sensitive workloads, even limited information disclosure can be catastrophic. Attackers could leverage disclosed memory contents to extract cryptographic keys, session tokens, or other secrets that facilitate further lateral movement within the network environment. This undermines the fundamental security model of virtualization, where isolation between guests and the host is paramount.
In terms of industry classification standards, this vulnerability aligns with CWE-122, which denotes a heap-based buffer overflow. The attack methodology corresponds to ATT&CK technique T1059, specifically involving command or script interpretation if code execution were achieved, but more directly relates to data exfiltration techniques such as T1074 for local data staging followed by remote transfer via network protocols like SMB or HTTP depending on the specific implementation details. The requirement for authentication places this within the scope of authenticated attacks, emphasizing the need for strict access controls and least privilege principles in managing Hyper-V hosts.
Mitigation strategies must focus on both immediate patching and long-term architectural hardening. Organizations should immediately apply the latest security updates provided by Microsoft to address the specific buffer overflow flaw in the Hyper-V component. Beyond patching, it is crucial to enforce network segmentation policies that restrict access to Hyper-V management interfaces and virtual machine communication channels only to authorized personnel and systems. Implementing strict input validation mechanisms at application boundaries can also help prevent similar vulnerabilities from being exploited in custom or third-party applications interacting with the hypervisor. Additionally, enabling advanced monitoring solutions to detect anomalous memory allocation patterns or unusual network traffic associated with exploitation attempts can provide early warning indicators of potential attacks targeting this class of vulnerability.