---
id: "CVE-2026-109498"
page: "https://infrastack.ai/live/CVE-2026-109498"
kind: "vulnerability"
aliases: ["CVE-2026-109498"]
title: "Microsoft Access: heap buffer overflow lets remote attacker run code"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Microsoft Office Access", "fixed": [], "affected": "", "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 365 Apps for Enterprise", "fixed": ["November 2026 build"], "affected": ">= 16.0.1, < November 2026 build (see aka.ms/OfficeSecurityReleases)", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["access", "microsoft-office", "other", "user-interaction", "windows"]
not_affected_if: ["no-access-installed", "patched-office"]
published_at: "2026-11-10T19:18:18+00:00"
first_seen_at: "2026-11-10T19:24:25+00:00"
updated_at: "2026-11-11T00:42:13+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109498", "first_seen_at": "2026-11-10T19:24:25+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109498", "first_seen_at": "2026-11-11T00:42:13+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/CVE-2026-109498", "https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates"]}]
exploit_sources: []
---

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

Link for people: https://infrastack.ai/live/CVE-2026-109498 (this .md is for agents)

Heap-based buffer overflow in Microsoft Office Access (CWE-122). Microsoft rates it 7.5 High (CVSS 3.1, AV:N/AC:H/UI:R): an attacker needs a user to open crafted content, and exploitation is high-complexity. No exploitation reported. Fixed in the November 10, 2026 Office security updates.

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

## Affected

- vendor:Microsoft Office Access affected range not listed fixed no fixed version listed
- 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 365 Apps for Enterprise affected >= 16.0.1, < November 2026 build (see aka.ms/OfficeSecurityReleases) fixed November 2026 build

## How to check

In any Office app, open File > Account > About and compare the build: Office LTSC 2021 needs 16.0.14334.21048 or later, LTSC 2024 needs 16.0.17932.21140 or later. Microsoft 365 Apps: see the build list at https://aka.ms/OfficeSecurityReleases (Current Channel 2610 build 20527.20196 per the Nov 10, 2026 release notes). Also check Access 2016/2019 if still in use; the CVE record does not list them.

## Fix

Update Office to the November 10, 2026 release: LTSC 2021 16.0.14334.21048+, LTSC 2024 16.0.17932.21140+, Microsoft 365 Apps to the November 2026 build for your channel.

## Timeline

- 2026-11-10T19:24:25+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109498
- 2026-11-11T00:42:13+00:00 analyst https://nvd.nist.gov/vuln/detail/CVE-2026-109498 — MSRC page did not render; used Microsoft CNA data via NVD/OpenCVE and Office release notes (Nov 10 2026). Not exploited per sources; no KEV. Nothing marked verified.

## Documents

- [advisory] NVD CVE-2026-109498 (CNA data from Microsoft) https://nvd.nist.gov/vuln/detail/CVE-2026-109498
- [fix] Microsoft Office security updates release notes (Nov 10, 2026) https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

## From the sources

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

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