---
id: "CVE-2026-112733"
page: "https://infrastack.ai/live/CVE-2026-112733"
kind: "vulnerability"
aliases: ["CVE-2026-112733"]
title: "Microsoft Word: heap buffer overflow allows remote code execution when a user opens a crafted file"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Microsoft Office Word", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2021", "fixed": ["16.0.14334.21048"], "affected": "< 16.0.14334.21048", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2024", "fixed": ["16.0.17932.21140"], "affected": "< 16.0.17932.21140", "ecosystem": "vendor"}, {"name": "Microsoft Office for Mac", "fixed": ["16.115.26110837"], "affected": "< 16.115.26110837", "ecosystem": "vendor"}, {"name": "Microsoft 365 Apps for Enterprise", "fixed": [], "affected": ">= 16.0.1, see aka.ms/OfficeSecurityReleases", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["macos", "microsoft-office", "other", "user-interaction", "windows", "word"]
not_affected_if: ["patched-office", "unknown"]
published_at: "2026-11-10T19:18:32+00:00"
first_seen_at: "2026-11-10T19:24:31+00:00"
updated_at: "2026-11-11T00:19:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112733", "first_seen_at": "2026-11-10T19:24:31+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112733", "first_seen_at": "2026-11-11T00:19:23+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/CVE-2026-112733", "https://app.opencve.io/cve/CVE-2026-112733"]}]
exploit_sources: []
---

# Microsoft Word: heap buffer overflow allows remote code execution when a user opens a crafted file

Link for people: https://infrastack.ai/live/CVE-2026-112733 (this .md is for agents)

Heap-based buffer overflow in Microsoft Office Word (CWE-122). Microsoft rates it CVSS 8.8 (AV:N/AC:L/PR:N/UI:R): the attacker needs the user to interact, typically by opening a crafted document. Success gives code execution as that user. Not in CISA KEV; Microsoft's vector marks exploit code as unproven (E:U).

_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 Office LTSC 2021 affected < 16.0.14334.21048 fixed 16.0.14334.21048
- vendor:Microsoft Office LTSC 2024 affected < 16.0.17932.21140 fixed 16.0.17932.21140
- vendor:Microsoft Office for Mac affected < 16.115.26110837 fixed 16.115.26110837
- vendor:Microsoft 365 Apps for Enterprise affected >= 16.0.1, see aka.ms/OfficeSecurityReleases fixed no fixed version listed

## How to check

Check your Office build (Word > File > Account > About Word) against the fixed builds: Office LTSC 2021 16.0.14334.21048, LTSC 2024 16.0.17932.21140, Office for Mac 16.115.26110837. For Microsoft 365 Apps, compare with https://aka.ms/OfficeSecurityReleases. Fixed-build numbers come from the CVE record, not the MSRC page, which I could not read.

## Fix

Update Office to the fixed build: LTSC 2021 16.0.14334.21048 or later, LTSC 2024 16.0.17932.21140 or later, Mac 16.115.26110837 or later; Microsoft 365 Apps per aka.ms/OfficeSecurityReleases.

## Timeline

- 2026-11-10T19:24:31+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112733
- 2026-11-11T00:19:23+00:00 analyst https://nvd.nist.gov/vuln/detail/CVE-2026-112733 — MSRC page is JS-only and returned nothing; used Microsoft CNA data as mirrored by NVD/OpenCVE. Nothing verified. No exploitation or KEV seen; no PoC checked.

## Documents

- [describes] NVD CVE-2026-112733 (Microsoft CNA data) https://nvd.nist.gov/vuln/detail/CVE-2026-112733
- [mentions] OpenCVE CVE-2026-112733 https://app.opencve.io/cve/CVE-2026-112733

## 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_