idunno.Bluesky, idunno.AtProto and idunno.AtProto.OAuthCallback Denial of Service Vulnerability

Impact

The Microsoft.Bcl.Memory package, a transitive dependency of idunno.AtProto and idunno.AtProto.OAuthCallback had a Denial of Service security vulnerability, CVE-2026-26127

Patches

v1.7.0 updates the dependencies on Duende.IdentityModel.OidcClient and Duende.IdentityModel.OidcClient.Extensions which, in turn, updates their dependency on Microsoft.Bcl.Memory to 10.0.4, resolving the vulnerability.

Workarounds

No workarounds exist for this vulnerability.

How to fix the issue

To update your dependencies on idunno.Bluesky, idunno.AtProto and idunno.AtProto.OAuthCallback,

Using the .NET CLI (Command Line Interface):

• Open a terminal or command prompt in your project's directory.

• To update a specific package to its latest version, use the following add package command:

  • If you are using idunno.Bluesky
dotnet package update idunno.Bluesky

  • If you are using idunno.AtProto as a direct dependency
    dotnet package update idunno.AtProto

  • If you are using idunno.AtProto.OAuthCallback as a direct dependency
    dotnet package update idunno.AtProto.OAuthCallback

Using the NuGet Package Manager Console in Visual Studio:

• Open your project in Visual Studio.

• Navigate to "Tools > NuGet Package Manager > Package Manager Console".

• To update a specific package to its latest version, use the following Update-Package command:

  • If you are using idunno.Bluesky
Update-Package -Id idunno.Bluesky

  • If you are using idunno.AtProto as a direct dependency
    Update-Package -Id idunno.AtProto

  • If you are using idunno.AtProto.OAuthCallback as a direct dependency
    Update-Package -Id idunno.AtProto.OAuthCallback

NuGet Package Manager UI in Visual Studio:

• Open your project in Visual Studio.
• Right-click on your project in Solution Explorer and select "Manage NuGet Packages..." or navigate to "Project > Manage NuGet Packages".
• In the NuGet Package Manager window, select the "Updates" tab. This tab lists packages with available updates from your configured package sources.
• Select the package(s) you wish to update. You can choose a specific version from the dropdown or update to the latest available version.
• Click the "Update" button.

References

• Microsoft Security Advisory CVE-2026-26127 – .NET Denial of Service Vulnerability
• CVE-2026-26127

References

• GHSA-8fh9-c4jq-94h4
• dotnet/announcements#384
• https://www.cve.org/CVERecord?id=CVE-2026-26127