What Happened
Microsoft released KB5081278 on March 10, 2026, a security update that patches three vulnerabilities in .NET 9.0 runtime and ASP.NET Core components.
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Microsoft Patches Critical .NET 9.0 Vulnerabilities in KB5081278 Security Update
The March 2026 .NET 9.0 servicing update resolves three high-severity vulnerabilities in runtime deserialization, ASP.NET Core request processing, and System.Text.Json.
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