---
id: "CVE-2026-112722"
page: "https://infrastack.ai/live/CVE-2026-112722"
kind: "vulnerability"
aliases: ["CVE-2026-112722"]
title: "Microsoft Word: heap buffer overflow can lead to code execution when a crafted file is opened"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Microsoft Office Word", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "Microsoft 365 Apps for Enterprise", "fixed": ["2610 20527.20196"], "affected": "16.0.1 up to the Nov 10, 2026 builds", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2024", "fixed": ["16.0.17932.21140"], "affected": "< 16.0.17932.21140", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2021", "fixed": ["16.0.14334.21048"], "affected": "< 16.0.14334.21048", "ecosystem": "vendor"}, {"name": "Microsoft Office for Mac (365, LTSC 2021, LTSC 2024)", "fixed": ["16.115.26110837"], "affected": "< 16.115.26110837", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["macos", "microsoft-office", "microsoft-word", "other", "user-interaction-required", "windows"]
not_affected_if: ["patched-nov-2026-build"]
published_at: "2026-11-10T19:18:30+00:00"
first_seen_at: "2026-11-10T19:24:30+00:00"
updated_at: "2026-11-11T00:21:42+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112722", "first_seen_at": "2026-11-10T19:24:30+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/cve-2026-112722", "first_seen_at": "2026-11-11T00:21:42+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/cve-2026-112722", "https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates"]}]
exploit_sources: []
---

# Microsoft Word: heap buffer overflow can lead to code execution when a crafted file is opened

Link for people: https://infrastack.ai/live/CVE-2026-112722 (this .md is for agents)

Heap-based buffer overflow (CWE-122, numeric truncation CWE-197) in Microsoft Office Word, rated CVSS 8.8 by Microsoft. The vector requires user interaction (UI:R), so a victim most likely has to open a crafted file. No exploitation or public PoC found. Fixed in the Nov 10, 2026 Office security updates.

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

## Affected

- vendor:Microsoft Office Word affected range not listed fixed no fixed version listed
- vendor:Microsoft 365 Apps for Enterprise affected 16.0.1 up to the Nov 10, 2026 builds fixed 2610 20527.20196
- vendor:Microsoft Office LTSC 2024 affected < 16.0.17932.21140 fixed 16.0.17932.21140
- vendor:Microsoft Office LTSC 2021 affected < 16.0.14334.21048 fixed 16.0.14334.21048
- 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 and compare the build. Fixed builds per Microsoft's Nov 10, 2026 release notes: Current Channel 2610 build 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. Mac: 16.115.26110837 (per NVD/Microsoft CNA data).

## Fix

Update Office to the Nov 10, 2026 release (e.g. Current Channel 2610 build 20527.20196; LTSC 2024 17932.21140; LTSC 2021 14334.21048; Office for Mac 16.115.26110837). Channel list: https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

## Timeline

- 2026-11-10T19:24:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112722
- 2026-11-11T00:21:42+00:00 analyst https://nvd.nist.gov/vuln/detail/cve-2026-112722 — MSRC page is JS-only and unreadable; used Microsoft Office release notes (Learn) listing the CVE under Word for Nov 10 2026 and NVD (Microsoft CNA) for ranges. Only fix verified; products/preview-pane behaviour not confirmed. Not exploited per Rapid7 (not in KEV).

## Documents

- [describes] NVD CVE-2026-112722 (Microsoft CNA data) https://nvd.nist.gov/vuln/detail/cve-2026-112722
- [fix] Release notes for Microsoft Office security updates (Nov 10, 2026) 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.

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