Summary
.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.
New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 9.0.118 and .NET Runtime 9.0.17.Security Fix(es):
* dotnet: .NET: Local file tampering via link following vulnerability (CVE-2026-45491)
* dotnet: ASP.NET Core: Denial of Service via uncontrolled resource consumption (CVE-2026-45591)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 14
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | aspnetcore-runtime-9.0 | 9.0.17-1.el9_8 |
| AlmaLinux · 9 | aspnetcore-runtime-dbg-9.0 | 9.0.17-1.el9_8 |
| AlmaLinux · 9 | aspnetcore-targeting-pack-9.0 | 9.0.17-1.el9_8 |
| AlmaLinux · 9 | dotnet-apphost-pack-9.0 | 9.0.17-1.el9_8 |
| AlmaLinux · 9 | dotnet-hostfxr-9.0 | 9.0.17-1.el9_8 |
| AlmaLinux · 9 | dotnet-runtime-9.0 | 9.0.17-1.el9_8 |
| AlmaLinux · 9 | dotnet-runtime-dbg-9.0 | 9.0.17-1.el9_8 |
| AlmaLinux · 9 | dotnet-sdk-9.0 | 9.0.118-1.el9_8 |
| AlmaLinux · 9 | dotnet-sdk-9.0-source-built-artifacts | 9.0.118-1.el9_8 |
| AlmaLinux · 9 | dotnet-sdk-aot-9.0 | 9.0.118-1.el9_8 |
| AlmaLinux · 9 | dotnet-sdk-dbg-9.0 | 9.0.118-1.el9_8 |
| AlmaLinux · 9 | dotnet-targeting-pack-9.0 | 9.0.17-1.el9_8 |
| AlmaLinux · 9 | dotnet-templates-9.0 | 9.0.118-1.el9_8 |
| AlmaLinux · 9 | netstandard-targeting-pack-2.1 | 9.0.118-1.el9_8 |
Vulnerabilities 2
-
High 7.5
ASP.NET Core Denial of Service Vulnerability
Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.
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Medium 6.2
.NET Tampering Vulnerability
Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.