---
id: CVE-2026-44805
title: Windows Network Controller (NC) Host Agent Denial of Service Vulnerability
summary: >-
  Use after free in Windows Network Controller (NC) Host Agent allows an
  authorized attacker to deny service locally.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-416
  - CWE-822
vendor: Microsoft
product: Windows Server 2019
affected:
  - windows_server_2019 >= 10.0.17763.0 < 10.0.17763.8880
  - >-
    windows_server_2019_server_core_installation >= 10.0.17763.0 <
    10.0.17763.8880
  - windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5256
  - windows_server_2025 >= 10.0.26100.0 < 10.0.26100.32995
  - >-
    windows_server_2025_server_core_installation >= 10.0.26100.0 <
    10.0.26100.32995
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T12:46:18.193427Z'
published: '2026-06-09'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:45:09.063Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-44805'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44805'
    label: Windows Network Controller (NC) Host Agent Denial of Service Vulnerability
tags:
  - cve.org
epss: 0.00399
epssPercentile: 0.31399
ingestedAt: '2026-09-24T14:44:21.364Z'
---

## Overview

Use after free in Windows Network Controller (NC) Host Agent allows an authorized attacker to deny service locally.

## Affected

- `windows_server_2019 >= 10.0.17763.0 < 10.0.17763.8880`
- `windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.8880`
- `windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5256`
- `windows_server_2025 >= 10.0.26100.0 < 10.0.26100.32995`
- `windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.32995`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.