fkie_cve-2026-120796

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

GHSA-cpw3-h88j-9f6x — Microsoft Security Advisory CVE-2026-120796 - .NET Denial of Service Vulnerability

Affected: NuGet: Microsoft.NETCore.App.Runtime.linux-arm, NuGet: Microsoft.NETCore.App.Runtime.linux-arm64, NuGet: Microsoft.NETCore.App.Runtime.linux-musl-arm, NuGet: Microsoft.NETCore.App.Runtime.linux-musl-arm64, NuGet: Microsoft.NETCore.App.Runtime.linux-musl-x64, NuGet: Microsoft.NETCore.App.Runtime.linux-x64, NuGet: Microsoft.NETCore.App.Runtime.osx-arm64, NuGet: Microsoft.NETCore.App.Runtime.osx-x64, NuGet: Microsoft.NETCore.App.Runtime.win-arm64, NuGet: Microsoft.NETCore.App.Runtime.win-x64 and 2 more

## Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET. This advisory provides guidance on updating affected applications and components.

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/499

## CVSS Details

- **Version:** 3.1 - **Severity:** Medium - **Score:** 5.3 (base score) - **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C` - **Weakness:** CWE-407

## Affected Platforms

- **Platforms:** Windows, Linux, macOS - **Architectures:** All

## <a name="affected-packages"></a>Affected Packages

The tables list affected version ranges and fixed package versions. Runtime and standalone deliveries are listed separately.

### .NET 11.0 - affected runtime packages

Package | Affected version | Patched version --- | --- | --- [Microsoft.NETCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm) | >= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148 | 11.0.0 [Microsoft.NETCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm64) | >= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148 | 11.0.0 [Microsoft.NETCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-musl-arm) | >= 11.0.0-preview.1.…

NCSC-2026-0473 — Kwetsbaarheden verholpen in Microsoft Developer Tools

NCSC-2026-0473

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fkie_cve-2026-120796

GHSA-cpw3-h88j-9f6x — Microsoft Security Advisory CVE-2026-120796 - .NET Denial of Service Vulnerability

NCSC-2026-0473 — Kwetsbaarheden verholpen in Microsoft Developer Tools