Heap-based Buffer Overflow in Windows Win32K

Publication date: 2026-09-08

Last updated on: 2026-09-09

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-09

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-69348

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows	-

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 Win32K, a core component of the Windows operating system. It allows an authorized attacker with local access to execute arbitrary code with elevated privileges by exploiting memory corruption.

Impact Analysis

An attacker could gain higher-level permissions on your system, allowing them to install programs, view or delete data, or create new accounts with full user rights. This could lead to complete system compromise if exploited successfully.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft Update to patch the Win32K heap-based buffer overflow vulnerability.

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