CVE-2026-62871

.NET Elevation of Privilege Vulnerability

CVE-2026-62871 is fixed in 3 products on 2 platforms, first by Microsoft .NET Windows Desktop Runtime 8.0 8.0.30, released July 23, 2026. 3 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.

HighFixed on 2 platforms

CVSS

7.8

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0047

40th percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
.NET 8.0 runtime installed on Windows		KB5122104	Aug 11, 2026
.NET 9.0 runtime installed on Windows		KB5122105	Aug 11, 2026
Windows apps
Microsoft .NET Windows Desktop Runtime 8.0	8.0.30	Microsoft .NET Windows Desktop Runtime 8.0 8.0.30	Jul 23, 2026
No fix yet
Microsoft Windows Desktop Runtime - 8.0.25 (arm64) (Windows apps)	No fix yet	no-fix	n/a
Microsoft Windows Desktop Runtime - 8.0.25 (x64) (Windows apps)	No fix yet	no-fix	n/a
Microsoft Windows Desktop Runtime - 8.0.25 (x86) (Windows apps)	No fix yet	no-fix	n/a

Details

Published
August 11, 2026
Weakness
Out-of-bounds Write
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62871

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/cve/CVE-2026-62871">CVE-2026-62871 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Is this on your machines?

Patchblox finds every install below the fixed version on Windows, macOS and Linux, and updates them through your release rings.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.