KB5046264: Cumulative update for .NET Framework, versions 3.5 and 4.8.1, on Windows Server 2022, November 2024. ASP.NET editing errors and .NET runtime problems addressed

For: Visual Studio users working with .NET Framework ASP.NET projects

• Visual Studio no longer shows a “type initializer” error while preparing an ASP.NET project for editing.¹
  Addresses the design-time compilation error involving System.Web.UI.Util in .NET Framework ASP.NET projects.

• In rare cases, an application is less likely to get stuck when part of it first enters the .NET runtime.²
  Addresses a possible infinite loop when a thread enters the Common Language Runtime for the first time.
• Applications using certain runtime speed optimizations are less likely to make an incorrect call through an interface.³
  Addresses incorrect interface call devirtualization when JIT optimizations are enabled.
• An issue with bypassing a security feature when generating a random byte is addressed.⁴
  Addresses the security feature bypass vulnerability involving SecUtility.RandomByte.
• An issue that could disclose information through a performance counter is addressed.⁵
  Addresses an information disclosure issue involving the performance counter.
• Applications running within resource limits are less likely to run out of memory while .NET cleans up unused objects.⁵
  Addresses out-of-memory exceptions during garbage collection for applications running under job limits.

For: Applications using UserPrincipal.GetAuthorizationGroups

• An issue with looking up which groups a user belongs to through a .NET API is addressed.⁶
  Addresses an issue with UserPrincipal.GetAuthorizationGroups retrieving a user's memberships.