---
id: CVE-2026-78439
title: >-
  Stack-based buffer overflow in Microsoft Graphics Component allows an
  unauthorized attacker to execute code over a network.
summary: >-
  Stack-based buffer overflow in Microsoft Graphics Component allows an
  unauthorized attacker to execute code over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-121
vendor: Microsoft
product: Microsoft Office 365 for Mac
affected:
  - office_365_for_mac >= 1.0.0 < 16.113.26091433
  - office_for_android >= 16.0.1 < 16.0.20430.20000
  - office_ltsc_for_mac_2021 >= 16.0.1 < 16.113.26091433
  - office_ltsc_for_mac_2024 >= 16.0.0 < 16.113.26091433
published: '2026-09-08'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T20:18:28.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78439'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78439'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-09T04:21:14.775387Z'
epss: 0.00837
epssPercentile: 0.55926
ingestedAt: '2026-09-08T19:08:49.628Z'
---

## Overview

Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.