---
id: "CVE-2026-119391"
page: "https://infrastack.ai/live/CVE-2026-119391"
kind: "vulnerability"
aliases: ["CVE-2026-119391"]
title: "Windows Hyper-V: use-after-free lets a local user gain higher privileges"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows Hyper-V", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "Windows 11 23H2", "fixed": ["10.0.22631.7711"], "affected": "< 10.0.22631.7711", "ecosystem": "vendor"}, {"name": "Windows 11 24H2", "fixed": ["10.0.26100.9974"], "affected": "< 10.0.26100.9974", "ecosystem": "vendor"}, {"name": "Windows 11 25H2", "fixed": ["10.0.26200.9974"], "affected": "< 10.0.26200.9974", "ecosystem": "vendor"}, {"name": "Windows 11 26H1", "fixed": ["10.0.28000.3501"], "affected": "< 10.0.28000.3501", "ecosystem": "vendor"}, {"name": "Windows 11 26H2", "fixed": ["10.0.26300.9974"], "affected": "< 10.0.26300.9974", "ecosystem": "vendor"}, {"name": "Windows Server 2022", "fixed": ["10.0.20348.5870"], "affected": "< 10.0.20348.5870", "ecosystem": "vendor"}, {"name": "Windows Server 2025", "fixed": ["10.0.26100.33822"], "affected": "< 10.0.26100.33822", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["hyper-v", "infrastructure", "local", "privilege-escalation", "windows", "windows-server"]
not_affected_if: ["hyper-v-role-not-installed"]
published_at: "2026-11-10T19:19:53+00:00"
first_seen_at: "2026-11-10T19:24:56+00:00"
updated_at: "2026-11-10T22:54:27+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119391", "first_seen_at": "2026-11-10T19:24:56+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/cve-2026-119391", "first_seen_at": "2026-11-10T22:54:27+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/cve-2026-119391"]}]
exploit_sources: []
---

# Windows Hyper-V: use-after-free lets a local user gain higher privileges

Link for people: https://infrastack.ai/live/CVE-2026-119391 (this .md is for agents)

A use-after-free bug in Windows Hyper-V lets an attacker who already has a local account raise their privileges. The sources give a CVSS score of 7.8 and say nothing else about the exploit path.

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

## Affected

- vendor:Windows Hyper-V affected range not listed fixed no fixed version listed
- vendor:Windows 11 23H2 affected < 10.0.22631.7711 fixed 10.0.22631.7711
- vendor:Windows 11 24H2 affected < 10.0.26100.9974 fixed 10.0.26100.9974
- vendor:Windows 11 25H2 affected < 10.0.26200.9974 fixed 10.0.26200.9974
- vendor:Windows 11 26H1 affected < 10.0.28000.3501 fixed 10.0.28000.3501
- vendor:Windows 11 26H2 affected < 10.0.26300.9974 fixed 10.0.26300.9974
- vendor:Windows Server 2022 affected < 10.0.20348.5870 fixed 10.0.20348.5870
- vendor:Windows Server 2025 affected < 10.0.26100.33822 fixed 10.0.26100.33822

## How to check

Run winver or [Environment]::OSVersion in PowerShell and compare the full build number with the fixed builds in the fix field. Hosts below the fixed build are affected. Also check Hyper-V is enabled: Get-WindowsFeature Hyper-V (Server) or Get-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V (client). Microsoft's CNA data lists the builds but not whether the role must be enabled; confirm on the MSRC page.

## Fix

Install the November 2026 Windows cumulative update: Win11 23H2 10.0.22631.7711, 24H2 10.0.26100.9974, 25H2 10.0.26200.9974, 26H1 10.0.28000.3501, 26H2 10.0.26300.9974, Server 2022 10.0.20348.5870, Server 2025 10.0.26100.33822.

## Timeline

- 2026-11-10T19:24:56+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119391
- 2026-11-10T22:54:27+00:00 analyst https://nvd.nist.gov/vuln/detail/cve-2026-119391 — Microsoft CNA affected/fixed builds read via NVD (MSRC page not retrievable); not marked verified. Not in ZDI's exploited list (only Outlook CVE-2026-124194 is exploited). No PoC found.

## Documents

- [describes] NVD CVE-2026-119391 (Microsoft CNA affected list) https://nvd.nist.gov/vuln/detail/cve-2026-119391

## From the sources

Use after free in Windows Hyper-V allows an authorized attacker to elevate privileges locally.

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