CVE-2026-56182

Analyzed Analyzed - Analysis Complete

Integer Overflow in Windows NTFS Leading to Privilege Escalation

Publication date: 2026-07-14

Last updated on: 2026-07-22

Assigner: Microsoft Corporation

Description

Integer overflow or wraparound in Windows NTFS 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

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-56182

EUVD

EUVD-2026-44240

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
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_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_26h1	to 10.0.28000.2525 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8875 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
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

CVE-2026-56182 is an integer overflow or wraparound vulnerability in Windows NTFS. This flaw allows an authorized attacker with local access to exploit the system and elevate their privileges.

An integer overflow occurs when a calculation exceeds the maximum value that can be stored in a given integer type, leading to unexpected behavior or security issues. In this case, it can be leveraged to gain higher privileges on the affected system.

Detection Guidance

This vulnerability involves an integer overflow in Windows NTFS. Detection typically requires analyzing system logs for unusual privilege escalation events or monitoring for NTFS-related crashes. Microsoft may provide detection guidance in security updates or tools like Microsoft Defender for Endpoint.

Impact Analysis

If you are using a system with Windows NTFS, this vulnerability could impact you in the following ways:

An attacker with local access and low privileges could exploit this flaw to gain elevated privileges on your system.
Elevated privileges could allow the attacker to perform unauthorized actions, such as installing malicious software, accessing sensitive data, or modifying system configurations.
This could lead to a full compromise of the affected system, potentially resulting in data breaches or further attacks within a network.

Compliance Impact

This vulnerability could impact compliance with common standards and regulations in the following ways:

GDPR: If the vulnerability leads to unauthorized access or exposure of personal data, it could result in a violation of GDPR requirements for data protection and breach notification.
HIPAA: For organizations handling protected health information (PHI), exploitation of this vulnerability could lead to unauthorized access to sensitive data, violating HIPAA's security and privacy rules.
Other standards (e.g., ISO 27001, NIST): Failure to mitigate this vulnerability could result in non-compliance with requirements for access control, system integrity, and risk management.

Organizations should apply patches or mitigations promptly to avoid potential compliance violations.

Mitigation Strategies

Apply the security update provided by Microsoft to address CVE-2026-56182. The update can be found in the Microsoft Update Guide for this vulnerability.

Ensure all Windows systems are updated to the latest patch level, especially those running NTFS.
Restrict local access to systems to only authorized users to minimize the risk of exploitation.
Monitor Microsoft's security advisories for any additional guidance or updates related to this vulnerability.

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