---
id: "CVE-2026-112726"
page: "https://infrastack.ai/live/CVE-2026-112726"
kind: "vulnerability"
aliases: ["CVE-2026-112726"]
title: "Microsoft Word: heap buffer overflow lets remote attacker run code"
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": ["see aka.ms/OfficeSecurityReleases"], "affected": ">= 16.0.1", "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: ["vendor"]
tags: ["macos", "microsoft-office", "other", "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: "2026-11-11T00:20:27+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112726", "first_seen_at": "2026-11-10T19:24:30+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/cve-2026-112726", "first_seen_at": "2026-11-11T00:20:27+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/cve-2026-112726", "https://app.opencve.io/cve/CVE-2026-112726"]}]
exploit_sources: []
---

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

Link for people: https://infrastack.ai/live/CVE-2026-112726 (this .md is for agents)

Heap-based buffer overflow (CWE-122, with numeric truncation CWE-197) in Microsoft Office Word allows remote code execution. Microsoft rates it CVSS 8.8 with user interaction required (a victim must open a crafted file). No exploitation or public PoC found as of 2026-11-11; not in CISA KEV. Per Microsoft's CNA record (published 2026-11-10), affected: 365 Apps for Enterprise (see aka.ms/OfficeSecurityReleases for the fixed build), Office LTSC 2021 < 16.0.14334.21048, Office LTSC 2024 < 16.0.17932.21140, Office for Mac (365, LTSC 2021, LTSC 2024) < 16.115.26110837.

_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 fixed see aka.ms/OfficeSecurityReleases
- 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 and compare the build to the fixed builds: LTSC 2021 16.0.14334.21048, LTSC 2024 16.0.17932.21140, Mac 16.115.26110837. For 365 Apps, check the current build against https://aka.ms/OfficeSecurityReleases. These come from the CNA record mirrored by NVD/OpenCVE; confirm on the MSRC page.

## Fix

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

## Timeline

- 2026-11-10T19:24:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112726
- 2026-11-11T00:20:27+00:00 analyst https://nvd.nist.gov/vuln/detail/cve-2026-112726 — MSRC Update Guide page is JS-only and returned no text, so nothing verified. Affected builds and CVSS (UI:R) come from Microsoft's CNA record as mirrored by NVD/OpenCVE. No exploitation or PoC found; not in KEV.

## Documents

- [describes] NVD CVE-2026-112726 (Microsoft CNA data) https://nvd.nist.gov/vuln/detail/cve-2026-112726
- [mentions] OpenCVE CVE-2026-112726 (copy of Microsoft CNA record) https://app.opencve.io/cve/CVE-2026-112726

## 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_