---
id: CVE-2026-69781
title: >-
  Missing release of memory after effective lifetime in Windows DHCP Client
  allows an unauthorized attacker to deny service over an adjacent network.
summary: >-
  Missing release of memory after effective lifetime in Windows DHCP Client
  allows an unauthorized attacker to deny service over an adjacent network.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-401
vendor: microsoft
product: windows_11_24h2
affected:
  - windows_11_24h2 < 10.0.26100.9445
  - windows_11_25h2 < 10.0.26200.9445
  - windows_11_26h1 < 10.0.28000.2954
  - windows_server_2025 < 10.0.26100.33438
patched:
  - windows_11_24h2 10.0.26100.9445
  - windows_11_25h2 10.0.26200.9445
  - windows_11_26h1 10.0.28000.2954
  - windows_server_2025 10.0.26100.33438
published: '2026-09-08'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T17:49:41.580'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-69781'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69781'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T20:39:21.327952Z'
epss: 0.00506
epssPercentile: 0.42075
ingestedAt: '2026-09-08T19:08:49.620Z'
---

## Overview

Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over an adjacent network.

## Affected

- `windows_11_24h2 < 10.0.26100.9445`
- `windows_11_25h2 < 10.0.26200.9445`
- `windows_11_26h1 < 10.0.28000.2954`
- `windows_server_2025 < 10.0.26100.33438`

## Remediation

Upgrade past the affected range:

- `windows_11_24h2 10.0.26100.9445`
- `windows_11_25h2 10.0.26200.9445`
- `windows_11_26h1 10.0.28000.2954`
- `windows_server_2025 10.0.26100.33438`