CVE-2026-20876
Unknown Unknown - Not Provided
Heap-Based Buffer Overflow in Windows VBS Enclave Elevates Privileges

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

Description
Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
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Meta Information
Published
2026-01-13
Last Modified
2026-01-13
Generated
2026-06-16
AI Q&A
2026-01-14
EPSS Evaluated
2026-06-14
NVD
CVE-2026-20876
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_virtualization_based_security *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
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Executive Summary

This vulnerability is a heap-based buffer overflow in the Windows Virtualization-Based Security (VBS) Enclave. It allows an authorized attacker to elevate their privileges locally on the affected system. [1]

Impact Analysis

An attacker who is already authorized on the system can exploit this vulnerability to gain higher privileges than they should have, potentially leading to full control over the system and compromising its confidentiality, integrity, and availability. [1]

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