Link following in Microsoft products - CVE-2026-45491

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Main Vulnerability Database Vulnerabilities #VU134117

Link following in Microsoft products - CVE-2026-45491

Published: June 9, 2026


Vulnerability identifier: #VU134117
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-45491
CWE-ID: CWE-59
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local attacker to compromise the system.

The vulnerability exists due to an insecure link following issue in .NET. A local attacker can perform tampering on the target system.


Affected software

.NET for Linux
.NET for macOS
.NET
Microsoft .NET Framework
Red Hat Enterprise Linux for IBM z Systems
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Ubuntu
Fedora
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
dotnet10 (Ubuntu package)
dotnet8.0 (Red Hat package)
dotnet8.0
dotnet9.0 (Red Hat package)
dotnet9.0
dotnet10.0

How to mitigate CVE-2026-45491

Install updates from vendor's website.

.NET for Linux - addressed in versions 8.0.28, 9.0.17
.NET - addressed in versions 8.0.28, 9.0.17
.NET for macOS - addressed in versions 8.0.28, 9.0.17
Microsoft .NET Framework - update to 10.0.9
dotnet10 (Ubuntu package) - addressed in versions 8.0.28-0ubuntu1~22.04.1, 8.0.28-0ubuntu1~24.04.1, 8.0.28-0ubuntu1~25.10.1, 8.0.128-0ubuntu1~22.04.1, 8.0.128-0ubuntu1~24.04.1, 8.0.128-0ubuntu1~25.10.1, 8.0.128-8.0.28-0ubuntu1~22.04.1, 8.0.128-8.0.28-0ubuntu1~24.04.1, 8.0.128-8.0.28-0ubuntu1~25.10.1, 9.0.17-0ubuntu1~25.10.1, 9.0.118-0ubuntu1~25.10.1, 9.0.118-9.0.17-0ubuntu1~25.10.1, 10.0.9-0ubuntu1~24.04.1, 10.0.9-0ubuntu1~25.10.1, 10.0.9-0ubuntu1~26.04.1, 10.0.109-0ubuntu1~24.04.1, 10.0.109-0ubuntu1~25.10.1, 10.0.109-0ubuntu1~26.04.1, 10.0.109-10.0.9-0ubuntu1~24.04.1, 10.0.109-10.0.9-0ubuntu1~25.10.1, 10.0.109-10.0.9-0ubuntu1~26.04.1
dotnet8.0 (Red Hat package) - addressed in versions 8.0.128-1.el8_10, 8.0.128-1.el9_6, 8.0.128-1.el10_0, 8.0.128-1.el10_2
dotnet8.0 - addressed in versions 8.0.128-1.fc43, 8.0.128-1.fc44
dotnet9.0 (Red Hat package) - addressed in versions 9.0.118-1.el8_10, 9.0.118-1.el10_0
dotnet9.0 - addressed in versions 9.0.118-1.fc43, 9.0.118-1.fc44
dotnet10.0 - update to 10.0.109-1.fc43

External References

Related Security Bulletins