---
id: "CVE-2026-119951"
page: "https://infrastack.ai/live/CVE-2026-119951"
kind: "vulnerability"
aliases: ["CVE-2026-119951"]
title: "Windows Deployment Services: use-after-free lets an unauthenticated attacker run code"
severity: "high"
cvss: 8.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows Server 2016", "fixed": ["10.0.14393.9688"], "affected": ">= 10.0.14393.0, < 10.0.14393.9688", "ecosystem": "microsoft"}, {"name": "Windows Server 2019", "fixed": ["10.0.17763.9487"], "affected": ">= 10.0.17763.0, < 10.0.17763.9487", "ecosystem": "microsoft"}, {"name": "Windows Server 2022", "fixed": ["10.0.20348.5870"], "affected": ">= 10.0.20348.0, < 10.0.20348.5870", "ecosystem": "microsoft"}, {"name": "Windows Server 2025", "fixed": ["10.0.26100.33822"], "affected": ">= 10.0.26100.0, < 10.0.26100.33822", "ecosystem": "microsoft"}]
ecosystems: []
tags: ["infrastructure", "self-hosted", "windows-deployment-services", "windows-server"]
not_affected_if: ["patched-build", "role-not-installed"]
published_at: "2026-11-10T19:20:18+00:00"
first_seen_at: "2026-11-10T19:25:04+00:00"
updated_at: "2026-11-10T22:16:30+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119951", "first_seen_at": "2026-11-10T19:25:04+00:00"}, {"source": "analyst", "url": "https://cveawg.mitre.org/api/cve/CVE-2026-119951", "first_seen_at": "2026-11-10T22:16:30+00:00", "cites": ["https://cveawg.mitre.org/api/cve/CVE-2026-119951"]}]
exploit_sources: []
---

# Windows Deployment Services: use-after-free lets an unauthenticated attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-119951 (this .md is for agents)

Windows Deployment Services has a use-after-free memory bug that can be triggered over the network. An unauthorized attacker can use it to execute code on the affected server.

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

## Affected

- microsoft:Windows Server 2016 affected >= 10.0.14393.0, < 10.0.14393.9688 fixed 10.0.14393.9688
- microsoft:Windows Server 2019 affected >= 10.0.17763.0, < 10.0.17763.9487 fixed 10.0.17763.9487
- microsoft:Windows Server 2022 affected >= 10.0.20348.0, < 10.0.20348.5870 fixed 10.0.20348.5870
- microsoft:Windows Server 2025 affected >= 10.0.26100.0, < 10.0.26100.33822 fixed 10.0.26100.33822

## How to check

On each Windows Server, check whether the WDS role is installed (PowerShell: Get-WindowsFeature WDS). If it is, compare the OS build (winver, or [System.Environment]::OSVersion.Version) with the fixed builds in the fix field; a lower build is vulnerable. Servers without the WDS role are not in scope.

## Fix

Install the November 2026 Windows Server cumulative update that brings the OS build to at least: Server 2016 10.0.14393.9688, Server 2019 10.0.17763.9487, Server 2022 10.0.20348.5870, Server 2025 10.0.26100.33822 (Server Core included). KB numbers not read; look them up on the MSRC entry.

## Timeline

- 2026-11-10T19:25:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119951
- 2026-11-10T22:16:30+00:00 analyst https://cveawg.mitre.org/api/cve/CVE-2026-119951 — Microsoft CNA CVE record (links to MSRC entry, which is JS-only and unreadable here) gives affected/fixed builds for Server 2016-2025. CISA SSVC: exploitation none. No PoC seen. WDS role requirement not stated, so who_affected and how_to_check not verified; KB numbers unread.

## Documents

- [advisory] Microsoft CNA CVE record: CVE-2026-119951 Windows Deployment Services RCE https://cveawg.mitre.org/api/cve/CVE-2026-119951

## From the sources

Use after free in Windows Deployment Services allows an unauthorized attacker to execute code over a network.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_