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critical · CVSS v3 8.8

CVE-2026-108449

A heap-based buffer overflow in Microsoft Office Word enables remote code execution over a network. The flaw can be triggered by an unauthor

Overview

A heap-based buffer overflow in Microsoft Office Word enables remote code execution over a network. The flaw can be triggered by an unauthorized attacker without user interaction. It poses a critical threat to organizations using Word.

Description

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

Impact

The vulnerability compromises confidentiality, integrity, and availability of documents and systems. Attackers can gain arbitrary code execution, potentially exfiltrating data or installing malware. End users and enterprises relying on Word are directly impacted.

Remediation

Apply the latest Office security updates immediately. Enable macro and script restrictions, and use application whitelisting. Segment network zones and monitor for anomalous outbound traffic. Keep all systems patched and perform regular vulnerability scans.

Risk context

Severity is critical with a CVSS v3 score of 8.8. No EPSS data is available, but the flaw remains high risk. Prompt patching is recommended.

Affected products

  • Microsoft Office Word
  • Microsoft Office 365
  • Windows 10 Office
  • Windows 11 Office

Scores

Severity
critical
CVSS v2
10
CVSS v3
8.8
CVSS v4
—
EPSS
—

heap-overflow office-word critical network-exploit buffer-overflow patch defense

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