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Microsoft has released .NET 10.0.7 as an out-of-band security update to address CVE-2026-40372 in the Microsoft.AspNetCore.DataProtection NuGet package. A regression introduced in 10.0.6 caused decryption failures and exposed a vulnerability where the managed authenticated encryptor could compute its HMAC validation tag over incorrect payload bytes and discard the hash, potentially leading to elevation of privilege. All users on .NET 10.0.0 through 10.0.6 are required to update. Installation involves downloading the updated SDK or runtime, verifying via `dotnet --info`, and rebuilding and redeploying applications.

.NET 10.0.7 Out-of-Band Security Update