EUVD-2026-40365

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI document containing a circular schema reference can cause proce...

CVE-2026-49451 Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI document containing a circular schema reference can cause proce...

CVE-2026-49451

The issue affects the OpenAPI.NET SDK used for OpenAPI document parsing in .NET. A circular schema reference in a small OpenAPI document can cause process termination via stack overflow when using public OpenAPI.NET reader APIs, applicable to both JSON and YAML paths. Affected versions range from...

Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing

Impact A small OpenAPI document containing a circular schema reference can cause process termination through stack overflow in Microsoft.OpenApi. The issue affects OpenAPI document parsing through public OpenAPI.NET reader APIs and has been confirmed across both JSON and YAML reader paths. Affect...

PT-2026-53915

Name of the Vulnerable Software and Affected Versions OpenAPI.NET versions 2.0.0-preview11 through 2.7.4 OpenAPI.NET versions 3.0.0 through 3.5.3 Description An issue in the parsing of OpenAPI documents can lead to process termination due to a stack overflow when a document contains a circular...