rootpwn

critical · CVSS v3 8.8

CVE-2026-108444

A heap-based buffer overflow in Microsoft Office can be triggered over a network, allowing an attacker to execute arbitrary code. The flaw e

Overview

A heap-based buffer overflow in Microsoft Office can be triggered over a network, allowing an attacker to execute arbitrary code. The flaw exists in multiple Office versions and can be exploited by unauthenticated users. It poses a significant threat to organizations using Office on networked environments.

Description

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

Impact

Confidentiality: attackers can read sensitive documents. Integrity: malicious code can modify or delete files. Availability: execution may crash Office, disrupting productivity. The primary impact is on end-users and administrators who rely on Office for daily operations.

Remediation

Apply the latest Microsoft Office security update from the official update channel. Ensure automatic updates are enabled for all Office installations. Disable legacy macro support and enforce Office Application Guard. Monitor network traffic for anomalous Office activity and apply network segmentation to limit exposure.

Risk context

Severity is critical with a CVSS v3 score of 8.8. No EPSS data is available, but the high severity indicates an urgent need for patching. Organizations should prioritize this update to mitigate potential exploitation.

Affected products

  • Microsoft Office 365
  • Microsoft Office 2019
  • Microsoft Office 2021
  • Microsoft Office 2024
  • Microsoft Office 2025

Scores

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

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

← All CVEs

Related CVEs

critical

CVE-2026-108442

Microsoft Office Word contains a use‑after‑free vulnerability that can be triggered over a network, enabling an attacker to execute arbitrary code. The flaw is critical and can compromise any system running affected Word versions. It is a high‑risk threat for organizations that rely on Office for document processing.

View analysis

critical

CVE-2026-108443

An off‑by‑one bug in Microsoft Office Word can be triggered over a network, enabling an attacker to execute arbitrary code. The flaw exists in the document parsing logic and can be exploited remotely without user interaction. It poses a critical threat to any environment running vulnerable Word versions.

View analysis

critical

CVE-2026-108445

Microsoft Office Word has a stack-based buffer overflow that can be triggered via a crafted document over a network. An attacker can execute arbitrary code without user interaction. This flaw is critical and can compromise any system running vulnerable Word versions.

View analysis

critical

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 unauthorized attacker without user interaction. It poses a critical threat to organizations using Word.

View analysis