---
id: CVE-2026-69918
title: >-
  Heap-based buffer overflow in Windows Core Messaging allows an authorized
  attacker to elevate privileges locally.
summary: >-
  Heap-based buffer overflow in Windows Core Messaging allows an authorized
  attacker to elevate privileges locally.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: microsoft
product: windows_10_1607
affected:
  - windows_10_1607 < 10.0.14393.9612
  - windows_10_1809 < 10.0.17763.9376
  - windows_10_21h2 < 10.0.19044.7807
  - windows_10_22h2 < 10.0.19045.7807
  - windows_11_23h2 < 10.0.22631.7652
  - windows_11_24h2 < 10.0.26100.9711
  - windows_11_25h2 < 10.0.26200.9711
  - windows_11_26h1 < 10.0.28000.3231
  - windows_11_26h2 < 10.0.26300.9711
  - windows_server_2016 < 10.0.14393.9612
  - windows_server_2019 < 10.0.17763.9376
  - windows_server_2022 < 10.0.20348.5761
  - windows_server_2025 < 10.0.26100.33650
patched:
  - windows_10_1607 10.0.14393.9612
  - windows_10_1809 10.0.17763.9376
  - windows_10_21h2 10.0.19044.7807
  - windows_10_22h2 10.0.19045.7807
  - windows_11_23h2 10.0.22631.7652
  - windows_11_24h2 10.0.26100.9711
  - windows_11_25h2 10.0.26200.9711
  - windows_11_26h1 10.0.28000.3231
  - windows_11_26h2 10.0.26300.9711
  - windows_server_2016 10.0.14393.9612
  - windows_server_2019 10.0.17763.9376
  - windows_server_2022 10.0.20348.5761
  - windows_server_2025 10.0.26100.33650
published: '2026-10-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:13:39.150'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-69918'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69918'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00407
epssPercentile: 0.34772
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-13T21:06:18.474079Z'
ingestedAt: '2026-10-13T19:43:28.966Z'
---

## Overview

Heap-based buffer overflow in Windows Core Messaging allows an authorized attacker to elevate privileges locally.

## Affected

- `windows_10_1607 < 10.0.14393.9612`
- `windows_10_1809 < 10.0.17763.9376`
- `windows_10_21h2 < 10.0.19044.7807`
- `windows_10_22h2 < 10.0.19045.7807`
- `windows_11_23h2 < 10.0.22631.7652`
- `windows_11_24h2 < 10.0.26100.9711`
- `windows_11_25h2 < 10.0.26200.9711`
- `windows_11_26h1 < 10.0.28000.3231`
- `windows_11_26h2 < 10.0.26300.9711`
- `windows_server_2016 < 10.0.14393.9612`
- `windows_server_2019 < 10.0.17763.9376`
- `windows_server_2022 < 10.0.20348.5761`
- `windows_server_2025 < 10.0.26100.33650`

## Remediation

Upgrade past the affected range:

- `windows_10_1607 10.0.14393.9612`
- `windows_10_1809 10.0.17763.9376`
- `windows_10_21h2 10.0.19044.7807`
- `windows_10_22h2 10.0.19045.7807`
- `windows_11_23h2 10.0.22631.7652`
- `windows_11_24h2 10.0.26100.9711`
- `windows_11_25h2 10.0.26200.9711`
- `windows_11_26h1 10.0.28000.3231`
- `windows_11_26h2 10.0.26300.9711`
- `windows_server_2016 10.0.14393.9612`
- `windows_server_2019 10.0.17763.9376`
- `windows_server_2022 10.0.20348.5761`
- `windows_server_2025 10.0.26100.33650`