---
id: "CVE-2026-112717"
page: "https://infrastack.ai/live/CVE-2026-112717"
kind: "vulnerability"
aliases: ["CVE-2026-112717"]
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": ["2610 20527.20196"], "affected": ">= 16.0.1, below the Nov 10 2026 build per aka.ms/OfficeSecurityReleases", "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", "fixed": ["16.115.26110837"], "affected": "< 16.115.26110837 (Office 365 for Mac, LTSC for Mac 2021 and 2024)", "ecosystem": "vendor"}]
ecosystems: []
tags: ["macos", "microsoft-office", "other", "user-interaction", "windows", "word"]
not_affected_if: ["patched-build", "unknown"]
published_at: "2026-11-10T19:18:29+00:00"
first_seen_at: "2026-11-10T19:24:30+00:00"
updated_at: "2026-11-11T00:23:37+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112717", "first_seen_at": "2026-11-10T19:24:30+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/cve-2026-112717", "first_seen_at": "2026-11-11T00:23:37+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/cve-2026-112717", "https://learn.microsoft.com/en-us/OfficeUpdates/microsoft365-apps-security-updates"]}]
exploit_sources: []
---

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

Link for people: https://infrastack.ai/live/CVE-2026-112717 (this .md is for agents)

A heap-based buffer overflow in Microsoft Office Word lets an attacker send a crafted input over a network to write past allocated memory. The sources say this allows an unauthorized attacker to execute code.

_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 per aka.ms/OfficeSecurityReleases fixed 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 affected < 16.115.26110837 (Office 365 for Mac, LTSC for Mac 2021 and 2024) fixed 16.115.26110837

## How to check

In Word: File > Account > About Word and compare the build to the fixed builds above (Mac: Word > About Word). Fleet-wide: check the Microsoft 365 Apps channel and build against https://aka.ms/OfficeSecurityReleases.

## Fix

Install the November 10, 2026 Office update. Windows: Current Channel / Office 2024 / Office 2021 Retail 2610 build 20527.20196 or later; Monthly Enterprise 2610 20527.20194, 2609 20430.20264, 2608 20326.20320; Semi-Annual Enterprise 2610 20527.20192, 2609 20430.20262, 2608 20326.20318; Office LTSC 2024 16.0.17932.21140; Office LTSC 2021 16.0.14334.21048. Mac: 16.115.26110837.

## Timeline

- 2026-11-10T19:24:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112717
- 2026-11-11T00:23:37+00:00 analyst https://nvd.nist.gov/vuln/detail/cve-2026-112717 — MSRC page is JS-only and unreadable; fix builds from Microsoft Learn Office security release notes (Nov 10, 2026 lists this CVE under Word); affected ranges from Microsoft CNA data on NVD. UI:R per CVSS vector. No exploitation or PoC found.

## Documents

- [advisory] NVD CVE-2026-112717 (CNA data from Microsoft) https://nvd.nist.gov/vuln/detail/cve-2026-112717
- [fix] 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

## From the sources

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

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_