CVE-2026-77504

Undergoing Analysis Undergoing Analysis - In Progress

Double Free in Microsoft Office Word

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

Double free in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-24

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-77504

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	office_word	*

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 Microsoft Office Word. A double free occurs when a program frees the same memory twice, which can lead to memory corruption. In this case, an unauthorized attacker could exploit this flaw to execute arbitrary code over a network.

Impact Analysis

If exploited, this vulnerability could allow an attacker to run malicious code on your system. This might lead to unauthorized access, data theft, installation of malware, or disruption of services. Users could lose control of their systems or have sensitive information compromised.

Compliance Impact

This vulnerability could lead to data breaches, which may violate GDPR or HIPAA requirements for data protection and confidentiality. Organizations affected by such breaches may face legal penalties, fines, or reputational damage due to non-compliance with these regulations.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office Word immediately to patch the double free vulnerability. Disable automatic opening of Office documents from untrusted sources and enable network monitoring for suspicious activity.

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