CVE-2026-118746

## 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. Unix Negotiate authentication can accept a request when required channel-binding information is missing. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/498 ## CVSS Details - **Version:** 3.1 - **Severity:** Medium - **Score:** 6.8 (base score) - **Vector:** `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C` - **Weakness:** CWE-636 ## Affected Platforms - **Platforms:** Linux, macOS - **Architectures:** Arm, Arm64, x64 ## <a name="affected-packages"></a>Affected Packages The tables list affected .NET 11 runtime package versions and fixed versions. The issue occurs during server-side Negotiate authentication with `PolicyEnforcement.Always` when the client omits the channel-binding token. ### .NET 11.0 - Linux 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, < 11.0.0-preview.7.26381.103 | 11.0.0 [Microsoft.NETCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm) | > 11.0.0-preview.7.26381.103, < 11.0.0 | 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, < 11.0.0-preview.7.26381.103 | 11.0.0 [Microsoft.NETCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm64) | > 11.0.0-preview.7.26381.103, < 11.0.0 | 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, < 11.0.0-preview.7.26381.103 | 11.0.0 [Microsoft.NETCore.App.Runtime.linux-musl-arm](ht