---
id: CVE-2026-62871
title: .NET Elevation of Privilege Vulnerability
summary: >-
  Out-of-bounds write in .NET allows an unauthorized attacker to execute code
  locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-787
  - CWE-122
vendor: Microsoft
product: .NET 8.0
affected:
  - .net_8.0 >= 8.0.0 < 8.0.30
  - .net_9.0 >= 9.0.0 < 9.0.19
  - visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.38
  - visual_studio_2026_version_18.8 >= 18.0 < 18.8.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-12T03:55:30.622636Z'
published: '2026-08-11'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T16:25:56.252Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-62871'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62871'
    label: .NET Elevation of Privilege Vulnerability
  - url: 'https://github.com/dotnet/wpf/security/advisories/GHSA-vg44-h755-9hw7'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62871'
  - url: 'https://github.com/dotnet/announcements/issues/431'
  - url: 'https://github.com/advisories/GHSA-vg44-h755-9hw7'
tags:
  - cve.org
  - ghsa
  - nuget
epss: 0.00396
epssPercentile: 0.33637
aliases:
  - GHSA-vg44-h755-9hw7
ecosystem: nuget
patched:
  - Microsoft.WindowsDesktop.App.Runtime.win-arm64 10.0.11
  - Microsoft.WindowsDesktop.App.Runtime.win-x64 10.0.11
  - Microsoft.WindowsDesktop.App.Runtime.win-x86 10.0.11
  - Microsoft.WindowsDesktop.App.Runtime.win-arm64 9.0.19
  - Microsoft.WindowsDesktop.App.Runtime.win-x64 9.0.19
  - Microsoft.WindowsDesktop.App.Runtime.win-x86 9.0.19
  - Microsoft.WindowsDesktop.App.Runtime.win-arm64 8.0.30
  - Microsoft.WindowsDesktop.App.Runtime.win-x64 8.0.30
  - Microsoft.WindowsDesktop.App.Runtime.win-x86 8.0.30
ingestedAt: '2026-08-11T19:48:28.941Z'
---

## Overview

Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.

## Affected

- `.net_8.0 >= 8.0.0 < 8.0.30`
- `.net_9.0 >= 9.0.0 < 9.0.19`
- `visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.38`
- `visual_studio_2026_version_18.8 >= 18.0 < 18.8.3`

## Remediation

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

## Package advisory (CVE-2026-62871)

Affected packages:

- `Microsoft.WindowsDesktop.App.Runtime.win-arm64 >= 10.0.0, <= 10.0.10`
- `Microsoft.WindowsDesktop.App.Runtime.win-x64 >= 10.0.0, <= 10.0.10`
- `Microsoft.WindowsDesktop.App.Runtime.win-x86 >= 10.0.0, <= 10.0.10`
- `Microsoft.WindowsDesktop.App.Runtime.win-arm64 >= 9.0.0, <= 9.0.18`
- `Microsoft.WindowsDesktop.App.Runtime.win-x64 >= 9.0.0, <= 9.0.18`
- `Microsoft.WindowsDesktop.App.Runtime.win-x86 >= 9.0.0, <= 9.0.18`
- `Microsoft.WindowsDesktop.App.Runtime.win-arm64 >= 8.0.0, <= 8.0.29`
- `Microsoft.WindowsDesktop.App.Runtime.win-x64 >= 8.0.0, <= 8.0.29`
- `Microsoft.WindowsDesktop.App.Runtime.win-x86 >= 8.0.0, <= 8.0.29`

Patched in:

- `Microsoft.WindowsDesktop.App.Runtime.win-arm64 10.0.11`
- `Microsoft.WindowsDesktop.App.Runtime.win-x64 10.0.11`
- `Microsoft.WindowsDesktop.App.Runtime.win-x86 10.0.11`
- `Microsoft.WindowsDesktop.App.Runtime.win-arm64 9.0.19`
- `Microsoft.WindowsDesktop.App.Runtime.win-x64 9.0.19`
- `Microsoft.WindowsDesktop.App.Runtime.win-x86 9.0.19`
- `Microsoft.WindowsDesktop.App.Runtime.win-arm64 8.0.30`
- `Microsoft.WindowsDesktop.App.Runtime.win-x64 8.0.30`
- `Microsoft.WindowsDesktop.App.Runtime.win-x86 8.0.30`

Source: https://github.com/advisories/GHSA-vg44-h755-9hw7