CVE-2026-71328

.NET and Visual Studio Remote Code Execution Vulnerability

CVE-2026-71328 is fixed in 9 products on 2 platforms, first by Microsoft ASP.NET Core Hosting Bundle 9.0 9.0.20, released August 14, 2026. 3 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.

HighFixed on 2 platforms

CVSS

8.8

Important

Exploitation

None reported

Exploitation Unlikely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0082

57th percentile

<p>Heap-based buffer overflow in Visual Studio allows an unauthorized attacker to execute code over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
.NET 10.0 runtime installed on Windows		KB5126106	Sep 8, 2026
.NET 8.0 runtime installed on Windows		KB5126104	Sep 8, 2026
.NET 9.0 runtime installed on Windows		KB5126105	Sep 8, 2026
Windows apps
Microsoft .NET Windows Desktop Runtime 10.0	10.0.12	Microsoft .NET Windows Desktop Runtime 10.0 10.0.12	Aug 22, 2026
Microsoft .NET Windows Desktop Runtime 8.0	8.0.31	Microsoft .NET Windows Desktop Runtime 8.0 8.0.31	Aug 22, 2026
Microsoft .NET Windows Desktop Runtime 9.0	9.0.20	Microsoft .NET Windows Desktop Runtime 9.0 9.0.20	Aug 21, 2026
Microsoft ASP.NET Core Hosting Bundle 10.0	10.0.12	Microsoft ASP.NET Core Hosting Bundle 10.0 10.0.12	Aug 22, 2026
Microsoft ASP.NET Core Hosting Bundle 8.0	8.0.31	Microsoft ASP.NET Core Hosting Bundle 8.0 8.0.31	Aug 22, 2026
Microsoft ASP.NET Core Hosting Bundle 9.0	9.0.20	Microsoft ASP.NET Core Hosting Bundle 9.0 9.0.20	Aug 14, 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
September 8, 2026
Weakness
Heap-based Buffer Overflow
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71328

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-2026-71328">CVE-2026-71328 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.