CVE-2026-58546

Analyzed Analyzed - Analysis Complete

Use of Uninitialized Resource in Windows RDP Allows Information Disclosure

Publication date: 2026-07-14

Last updated on: 2026-07-22

Assigner: Microsoft Corporation

Description

Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.

CVSS Scores

EPSS Scores

Probability:
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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-2026-58546

EUVD

EUVD-2026-44289

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_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_11_24h2	to 10.0.26100.8875 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8875 (exc)
microsoft	windows_server_2025	to 10.0.26100.33158 (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)
microsoft	windows_server_2022	to 10.0.20348.5386 (exc)
microsoft	windows_server_2016	to 10.0.14393.9339 (exc)
microsoft	windows_server_2019	to 10.0.17763.9020 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-908	The product uses or accesses a resource that has not been initialized.

Attack-Flow Graph

Executive Summary

CVE-2026-58546 is a vulnerability in Windows Remote Desktop Protocol (RDP) where an uninitialized resource is used. This flaw allows an unauthorized attacker to disclose sensitive information over a network.

The vulnerability arises because the system fails to properly initialize a resource before it is accessed, which can lead to the exposure of memory contents or other sensitive data to the attacker.

Impact Analysis

This vulnerability can impact you in the following ways:

An attacker could exploit this flaw to access sensitive information transmitted over the network, such as credentials, personal data, or other confidential details.
If the compromised information includes authentication details, it could lead to further attacks, such as unauthorized access to systems or accounts.
The vulnerability does not require high privileges or complex interaction, making it easier for attackers to exploit remotely.

Compliance Impact

This vulnerability can affect compliance with common standards and regulations in the following ways:

GDPR: If the disclosed information includes personal data of EU citizens, this could constitute a data breach under GDPR. Organizations may face fines or penalties for failing to protect such data.
HIPAA: For organizations handling protected health information (PHI), this vulnerability could lead to unauthorized disclosure of PHI, violating HIPAA's privacy and security rules. This may result in legal consequences or fines.
Other standards (e.g., ISO 27001, NIST): The vulnerability may indicate a failure to implement proper security controls, such as secure coding practices or memory management, which are required by these frameworks.

Mitigation Strategies

To mitigate CVE-2026-58546, apply the security update provided by Microsoft as soon as possible. The update addresses the use of uninitialized resource in Windows RDP that could lead to information disclosure.

Visit the Microsoft Security Response Center (MSRC) update guide for CVE-2026-58546 to download and install the patch.
Ensure all systems running Windows RDP are updated to the latest secure version.
Monitor Microsoft's official communications for any additional guidance or updates related to this vulnerability.

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