Inefficient Algorithmic Complexity in Visual Studio - CVE-2026-109478

Vulnerability identifier: #VU164741

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-109478

CWE-ID: CWE-407

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient algorithmic complexity in ASP.NET Core when processing network requests. A remote attacker can send specially crafted requests that trigger excessive resource consumption to cause a denial of service.

Visual Studio
Ubuntu
dotnet-runtime-8.0 (Ubuntu package)
dotnet-host-8.0 (Ubuntu package)
dotnet-hostfxr-8.0 (Ubuntu package)
aspnetcore-runtime-8.0 (Ubuntu package)
dotnet-sdk-8.0 (Ubuntu package)
dotnet8 (Ubuntu package)
dotnet-runtime-10.0 (Ubuntu package)
dotnet-hostfxr-10.0 (Ubuntu package)
dotnet-host-10.0 (Ubuntu package)
aspnetcore-runtime-10.0 (Ubuntu package)
dotnet-sdk-10.0 (Ubuntu package)
dotnet-sdk-aot-10.0 (Ubuntu package)
dotnet10 (Ubuntu package)

Install security update from vendor's website.

Visual Studio - update to 17.14.45
dotnet-runtime-8.0 (Ubuntu package) - addressed in versions 8.0.34-0ubuntu1~22.04.1, 8.0.34-0ubuntu1~24.04.1
dotnet-host-8.0 (Ubuntu package) - addressed in versions 8.0.34-0ubuntu1~22.04.1, 8.0.34-0ubuntu1~24.04.1
dotnet-hostfxr-8.0 (Ubuntu package) - addressed in versions 8.0.34-0ubuntu1~22.04.1, 8.0.34-0ubuntu1~24.04.1
aspnetcore-runtime-8.0 (Ubuntu package) - addressed in versions 8.0.34-0ubuntu1~22.04.1, 8.0.34-0ubuntu1~24.04.1
dotnet-sdk-8.0 (Ubuntu package) - addressed in versions 8.0.134-0ubuntu1~22.04.1, 8.0.134-0ubuntu1~24.04.1
dotnet8 (Ubuntu package) - addressed in versions 8.0.134-8.0.34-0ubuntu1~22.04.1, 8.0.134-8.0.34-0ubuntu1~24.04.1
dotnet-runtime-10.0 (Ubuntu package) - update to 10.0.15-0ubuntu1~24.04.1
dotnet-hostfxr-10.0 (Ubuntu package) - update to 10.0.15-0ubuntu1~24.04.1
dotnet-host-10.0 (Ubuntu package) - update to 10.0.15-0ubuntu1~24.04.1
aspnetcore-runtime-10.0 (Ubuntu package) - update to 10.0.15-0ubuntu1~24.04.1
dotnet-sdk-10.0 (Ubuntu package) - update to 10.0.115-0ubuntu1~24.04.1
dotnet-sdk-aot-10.0 (Ubuntu package) - update to 10.0.115-0ubuntu1~24.04.1
dotnet10 (Ubuntu package) - update to 10.0.115-10.0.15-0ubuntu1~24.04.1

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-109478
• https://support.microsoft.com/help/5135243

• Multiple vulnerabilities in Visual Studio
• Ubuntu update for dotnet10, dotnet11, dotnet8