CVE-2026-71328: .NET and Visual Studio Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Unlikely

Patch Tuesday

2026-Sep

Released

2026-09-08

Description

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

FAQ

According to the CVSS metric, the attack vector is network (AV:N) and user interaction is required (UI:R). What is the target context of the remote code execution? This attack requires a user to open a specially crafted file from the attacker to initiate remote code execution.

Affected Products (6)

Developer Tools

• Microsoft Visual Studio 2026 version 18.9
• .NET 10.0 installed on Windows
• .NET 8.0 installed on Windows
• .NET 9.0 installed on Windows
• Microsoft Visual Studio 2022 version 17.14
• .NET 11.0 installed on Windows

Security Updates (6)

• Release Notes
• 5126106
• 5126104
• 5126105
• Release Notes
• Security Update

Acknowledgments

41ae55e9310ff27fa6f26af4727e5590

Revision History

• 2026-09-08: Information published.