<PackageReference Include="System.Security.Permissions" Version="10.0.5" />

System.Security.Permissions.EnvironmentPermissionAttribute

Allows security actions for EnvironmentPermission to be applied to code using declarative security. This class cannot be inherited.
namespace System.Security.Permissions { public sealed class EnvironmentPermissionAttribute : CodeAccessSecurityAttribute { public string All { get; set; } public string Read { get; set; } public string Write { get; set; } public EnvironmentPermissionAttribute(SecurityAction action); } }