CVE-2026-50309

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in Windows NTFS

Publication date: 2026-07-14

Last updated on: 2026-07-22

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-14

Last Modified

2026-07-22

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-50309

EUVD

EUVD-2026-43864

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_11_24h2	to 10.0.26100.8875 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8875 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8875 (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 Windows NTFS. It allows an authorized attacker to execute arbitrary code locally by exploiting a flaw in memory handling.

Detection Guidance

This vulnerability is a heap-based buffer overflow in Windows NTFS that allows local code execution. Detection typically requires checking for unusual system behavior or known indicators of compromise rather than specific commands. Monitor for crashes, unexpected processes, or unauthorized file modifications. Use Windows Event Viewer to review system logs for NTFS-related errors or application crashes.

Impact Analysis

An attacker could gain control of your system, install malware, steal data, or perform other malicious actions. Since it requires local access, physical or network access to the system is needed.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations must patch systems to maintain compliance.

Mitigation Strategies

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

Hi! I’m here to help you understand CVE-2026-50309. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70