CVE-2026-83916

Analyzed Analyzed - Analysis Complete

Double Free in Windows Error Reporting Allows Local Code Execution

Publication date: 2026-10-13

Last updated on: 2026-10-29

Assigner: Microsoft Corporation

Description

Double free in Windows Error Reporting allows an authorized attacker to execute code locally.

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-29

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-83916

EUVD

EUVD-2026-99434

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (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 Windows Error Reporting. A double free occurs when a program frees the same memory block twice, which can lead to memory corruption. An authorized attacker could exploit this to execute arbitrary code on the affected system.

Detection Guidance

Detection of CVE-2026-83916 requires monitoring for unusual activity in Windows Error Reporting (WER) processes. Check for crashes in WerFault.exe or related services. Use Event Viewer to inspect application and system logs for WER-related errors. Microsoft Defender ATP or similar EDR tools can detect anomalous behavior.

Impact Analysis

An attacker with local access could exploit this to run malicious code on your system, potentially gaining control over it. This could allow them to install malware, steal data, or perform other unauthorized actions.

Compliance Impact

This vulnerability allows an authorized attacker to execute code locally, which could lead to unauthorized access or data breaches. Such breaches may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information, depending on the affected system and data.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Error Reporting double free vulnerability. Monitor Microsoft's update guide for the official patch and install it immediately.

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