CVE-2026-62871: .NET Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 7.8)

CVSS Vector

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

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Aug

Released

2026-08-11

Description

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

FAQ

What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges. According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? Exploitation of this vulnerability requires that a user trigger the payload in the application.

Affected Products (10)

Developer Tools

• .NET 10.0 installed on Mac OS
• .NET 10.0 installed on Linux
• .NET 8.0 installed on Windows
• .NET 8.0 installed on Linux
• .NET 8.0 installed on Mac OS
• .NET 9.0 installed on Linux
• .NET 9.0 installed on Mac OS
• .NET 9.0 installed on Windows
• Microsoft Visual Studio 2026 version 18.8
• Microsoft Visual Studio 2022 version 17.14

Security Updates (3)

• 5122106
• 5122104
• 5122105

Acknowledgments

kai63001, <a href="https://x.com/ky0tofu">Ky0toFu</a>, 41ae55e9310ff27fa6f26af4727e5590

Revision History

• 2026-08-11: Information published.