CVE-2026-50477

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in Windows Kernel

Publication date: 2026-07-14

Last updated on: 2026-07-22

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-14

Last Modified

2026-07-22

Generated

2026-08-03

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-50477

EUVD

EUVD-2026-44086

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_11_26h1	to 10.0.28000.2269 (exc)
microsoft	windows_10_1607	to 10.0.14393.9339 (exc)
microsoft	windows_10_1607	to 10.0.14393.9339 (exc)
microsoft	windows_10_1809	to 10.0.17763.9020 (exc)
microsoft	windows_10_1809	to 10.0.17763.9020 (exc)
microsoft	windows_server_2016	to 10.0.14393.9339 (exc)
microsoft	windows_server_2019	to 10.0.17763.9020 (exc)
microsoft	windows_server_2022	to 10.0.20348.5386 (exc)
microsoft	windows_server_2025	to 10.0.26100.33158 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2525 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8875 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8875 (exc)

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 the Windows Kernel. It allows an authorized attacker with local access to execute arbitrary code with elevated privileges by exploiting memory corruption in the kernel.

Detection Guidance

Detection of this vulnerability requires checking for specific Windows Kernel updates or patches. Use PowerShell commands like 'Get-HotFix' to list installed updates and verify if the relevant patch for CVE-2026-50477 is missing. Compare the system's build number against Microsoft's advisory for the fix.

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.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating confidentiality requirements in GDPR and HIPAA. Organizations may face compliance penalties if systems are not patched promptly.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Kernel heap-based buffer overflow vulnerability. Monitor Microsoft's security advisories for patches and install them promptly.

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