CVE-2026-61366

Analyzed Analyzed - Analysis Complete

Double Free in Windows Network Connection Broker

Publication date: 2026-08-11

Last updated on: 2026-08-16

Assigner: Microsoft Corporation

Description

Double free in Windows Network Connection Broker allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-16

Generated

2026-08-31

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-61366

EUVD

EUVD-2026-56328

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_server_2016	to 10.0.14393.9418 (exc)
microsoft	windows_server_2019	to 10.0.17763.9115 (exc)
microsoft	windows_server_2022	to 10.0.20348.5440 (exc)
microsoft	windows_server_2025	to 10.0.26100.33222 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-415	The product calls free() twice on the same memory address.

Attack-Flow Graph

Executive Summary

This vulnerability is a double free issue in the Windows Network Connection Broker component. A double free occurs when a program frees the same memory block twice, which can lead to memory corruption and allow an attacker to execute arbitrary code or elevate privileges.

Detection Guidance

This vulnerability involves a double free in Windows Network Connection Broker. Detection requires checking for unusual privilege escalation events or crashes in the Network Connection Broker service. Monitor Event Viewer logs for application crashes or security alerts related to Windows Network Connection Broker. Ensure all Windows systems are updated with the latest security patches from Microsoft.

Impact Analysis

An authorized attacker could exploit this to gain higher privileges on your system, potentially allowing them to install programs, view or delete data, or create new accounts with full user rights.

Compliance Impact

This vulnerability allows local privilege escalation, which could enable unauthorized access to sensitive data or system functions. Such access could violate compliance requirements under GDPR (data protection) or HIPAA (health information security) if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Network Connection Broker component. Monitor Microsoft's security advisories for patches and install them promptly.

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