CVE-2026-83916

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Double Free in Windows Error Reporting Allows Local Code Execution

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-83916

EUVD

EUVD-2026-99434

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1607 10.0.14393.0
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	10 Version 21H2 10.0.19044.0
Microsoft	Windows	10 Version 22H2 10.0.19045.0
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2012 6.2.9200.0
Microsoft	Windows	Server 2012 (Server Core installation) 6.2.9200.0
Microsoft	Windows	Server 2012 R2 6.3.9600.0
Microsoft	Windows	Server 2012 R2 (Server Core installation) 6.3.9600.0
Microsoft	Windows	Server 2016 10.0.14393.0
Microsoft	Windows	Server 2016 (Server Core installation) 10.0.14393.0
Microsoft	Windows	Server 2019 10.0.17763.0
Microsoft	Windows	Server 2019 (Server Core installation) 10.0.17763.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

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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