---
id: "CVE-2026-112728"
page: "https://infrastack.ai/live/CVE-2026-112728"
kind: "vulnerability"
aliases: ["CVE-2026-112728"]
title: "Microsoft Word: heap buffer overflow lets a remote attacker run code"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Microsoft 365 Apps for Enterprise", "fixed": ["Current Channel 2610 20527.20196"], "affected": ">= 16.0.1, below the Nov 10 2026 build for your channel", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2021", "fixed": ["16.0.14334.21048"], "affected": ">= 16.0.1, < 16.0.14334.21048", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2024", "fixed": ["16.0.17932.21140"], "affected": ">= 16.0.0, < 16.0.17932.21140", "ecosystem": "vendor"}, {"name": "Microsoft Office for Mac (365, LTSC 2021, LTSC 2024)", "fixed": ["16.115.26110837"], "affected": "< 16.115.26110837", "ecosystem": "vendor"}]
ecosystems: []
tags: ["macos", "microsoft-office", "other", "user-interaction", "windows", "word"]
not_affected_if: []
published_at: "2026-11-10T19:18:31+00:00"
first_seen_at: "2026-11-10T19:24:30+00:00"
updated_at: "2026-11-11T00:19:24+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112728", "first_seen_at": "2026-11-10T19:24:30+00:00"}, {"source": "analyst", "url": "https://learn.microsoft.com/en-us/OfficeUpdates/microsoft365-apps-security-updates", "first_seen_at": "2026-11-11T00:19:24+00:00", "cites": ["https://learn.microsoft.com/en-us/OfficeUpdates/microsoft365-apps-security-updates", "https://nvd.nist.gov/vuln/detail/CVE-2026-112728"]}]
exploit_sources: []
---

# Microsoft Word: heap buffer overflow lets a remote attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-112728 (this .md is for agents)

A heap-based buffer overflow in Microsoft Office Word lets an unauthorized attacker run code over a network. Sources give no further detail on the trigger or affected builds.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft 365 Apps for Enterprise affected >= 16.0.1, below the Nov 10 2026 build for your channel fixed Current Channel 2610 20527.20196
- vendor:Microsoft Office LTSC 2021 affected >= 16.0.1, < 16.0.14334.21048 fixed 16.0.14334.21048
- vendor:Microsoft Office LTSC 2024 affected >= 16.0.0, < 16.0.17932.21140 fixed 16.0.17932.21140
- vendor:Microsoft Office for Mac (365, LTSC 2021, LTSC 2024) affected < 16.115.26110837 fixed 16.115.26110837

## How to check

In Word: File > Account > About Word, compare the build with the fixed builds above (Windows: below 16.0.17932.21140 on LTSC 2024, below 16.0.14334.21048 on LTSC 2021, or a 365 Apps build older than the Nov 10 2026 release for your channel). On Mac: Word > About Word, below 16.115.26110837 is affected.

## Fix

Update Microsoft 365 Apps / Office to the Nov 10, 2026 builds: Current Channel 2610 (20527.20196); Monthly Enterprise 2610 (20527.20194), 2609 (20430.20264), 2608 (20326.20320); Office LTSC 2024 16.0.17932.21140; Office LTSC 2021 16.0.14334.21048; Office 2019 volume 1808 (10417.20236); Office for Mac 16.115.26110837 or later.

## Timeline

- 2026-11-10T19:24:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112728
- 2026-11-11T00:19:24+00:00 analyst https://learn.microsoft.com/en-us/OfficeUpdates/microsoft365-apps-security-updates — Microsoft Nov 2026 Patch Tuesday; Learn release notes list CVE under Word in the Nov 10 builds; affected list from Microsoft CNA data in NVD. MSRC page is JS-only, not read; exploitation/PoC none found.

## Documents

- [advisory] Release notes for Microsoft Office security updates (Nov 10, 2026 lists CVE-2026-110053 under Word) https://learn.microsoft.com/en-us/OfficeUpdates/microsoft365-apps-security-updates
- [describes] NVD CVE-2026-112728 (Microsoft CNA affected list and CVSS) https://nvd.nist.gov/vuln/detail/CVE-2026-112728

## From the sources

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

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