CVE-2026-62897: .NET Framework Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 7)

CVSS Vector

CVSS:3.1/AV:L/AC:H/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

Integer overflow or wraparound in .NET Framework allows an unauthorized attacker to execute code locally.

FAQ

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? A high attack complexity means that successful exploitation is complex and time‑consuming, requiring significant effort and precise conditions for an attacker to reliably exploit the vulnerability.

Affected Products (17)

Developer Tools

• Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems
• .NET 10.0 installed on Mac OS
• Microsoft .NET Framework 3.5 on Windows 11 Version 26H1 for ARM64-based Systems
• Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems
• .NET 9.0 installed on Mac OS
• .NET 10.0 installed on Windows
• .NET 10.0 installed on Linux
• Microsoft .NET Framework 3.5 on Windows 11 version 26H1 for x64-based Systems
• .NET 8.0 installed on Mac OS
• .NET 8.0 installed on Linux
• .NET 9.0 installed on Linux
• .NET 8.0 installed on Windows
• .NET 9.0 installed on Windows
• Microsoft Visual Studio 2026 version 18.8
• Microsoft Visual Studio 2022 version 17.14
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems
• Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems

Security Updates (7)

• 5120711
• 5122106
• 5120747
• 5122105
• 5122104
• 5120703
• 5120698

Acknowledgments

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

Revision History

• 2026-08-11: Information published.