CVE-2026-83931

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Heap-based Buffer Overflow in Windows Hyper-V

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-13

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-83931

EUVD

EUVD-2026-100058

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

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().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow vulnerability in Windows Hyper-V. It allows an authorized attacker with local access to execute arbitrary code on the affected system by exploiting a memory corruption issue.

Impact Analysis

An attacker could gain control of your system, install programs, view or delete data, or create new accounts with full user rights. Since it requires local access, physical or prior network compromise is needed.

Compliance Impact

This vulnerability could potentially lead to unauthorized code execution on systems running affected Windows versions, which may compromise data confidentiality and integrity. For GDPR, this could result in unauthorized access to personal data, requiring breach notifications under Article 33. For HIPAA, it may violate safeguards for protected health information if exploited on systems handling such data.

Mitigation Strategies

Apply the latest security updates from Microsoft for Windows Hyper-V and related components. Monitor Microsoft's update guide for patches and install them promptly.

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