CVE-2026-45491: .NET Tampering Vulnerability

Overview

Severity

Medium (CVSS 6.2)

CVSS Vector

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

Category

Tampering

Exploit Status

Not Exploited

Exploitation Likelihood

Unlikely

Patch Tuesday

2026-Jun

Released

2026-06-09

Description

Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

Affected Products (10)

Developer Tools

• .NET 10.0 installed on Windows
• .NET 10.0 installed on Mac OS
• .NET 10.0 installed on Linux
• .NET 8.0
• .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

Security Updates (3)

• 5097148
• 5097149
• 5097150

Acknowledgments

Anonymous, <a href="https://www.linkedin.com/in/ashmitsh4rma/">Ashmit Sharma</a>, <a href="https://www.linkedin.com/in/ashmitsh4rma/">Ashmit Sharma</a>, <a href="https://x.com/ky0tofu">Ky0toFu</a>, <a href="https://x.com/ky0tofu">Ky0toFu</a>, phrolo7a

Revision History

• 2026-06-09: Information published.