{"id":32984,"date":"2021-05-20T19:57:07","date_gmt":"2021-05-21T02:57:07","guid":{"rendered":"https:\/\/devblogs.microsoft.com\/dotnet\/?p=32984"},"modified":"2021-05-20T19:57:07","modified_gmt":"2021-05-21T02:57:07","slug":"net-framework-may-2021-cumulative-update-preview","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/dotnet\/net-framework-may-2021-cumulative-update-preview\/","title":{"rendered":".NET Framework May 2021 Cumulative Update Preview"},"content":{"rendered":"<p>Today, we are releasing the May 2021 Cumulative Update Preview for .NET Framework.<\/p>\n<h3>Quality and Reliability<\/h3>\n<p>This release contains the following quality and reliability improvements.<\/p>\n<h5>CLR<span style=\"font-size: 12pt;\"><sup>1<\/sup><\/span><\/h5>\n<ul>\n<li>Addresses a performance issue caused by incorrect configuration in the GC.<\/li>\n<li>Addresses an issue where a background GC could pause the runtime for a long period of time if a large managed heap is filled with long lived objects with a deep chain of references.<\/li>\n<li>Addresses an issue where crashes could occur if security stackwalks were generated during ThreadAbortException handling.<\/li>\n<\/ul>\n<h5>NCL<span style=\"font-size: 12pt;\"><sup>2<\/sup><\/span><\/h5>\n<ul>\n<li>.NET Framework 4.8 will now allow to negotiate TLS 1.3 if underlying OS supports it.<\/li>\n<\/ul>\n<h5>WPF<span style=\"font-size: 12pt;\"><sup>3<\/sup><\/span><\/h5>\n<ul>\n<li>Addresses an issue when rapid typing using an IME can crash via FailFast.<\/li>\n<li>Addresses an issue where Thaana characters displayed in left-to-right order.<\/li>\n<li>Addresses a crash when WebBrowser receives a completion event for a navigation it tried to cancel.<\/li>\n<\/ul>\n<p><sup>1 <\/sup>Common Language Runtime (CLR)\n<sup>2 <\/sup>Network Class Library (NCL)\n<sup>3 <\/sup>Windows Presentation Foundation (WPF)<\/p>\n<h3><a id=\"user-content-getting-the-update\" class=\"anchor\" href=\"#getting-the-update\"><\/a>Getting the Update<\/h3>\n<p>The Cumulative Update Preview is available via Windows Update and Microsoft Update Catalog.<\/p>\n<h5><a id=\"user-content-microsoft-update-catalog\" class=\"anchor\" href=\"#microsoft-update-catalog\"><\/a>Microsoft Update Catalog<\/h5>\n<p>You can get the update via the Microsoft Update Catalog. Customers that rely on Windows Update will automatically receive the .NET Framework version-specific updates. Advanced system administrators can also take use of the below direct Microsoft Update Catalog download links to .NET Framework-specific updates. Before applying these updates, please ensure that you carefully review the .NET Framework version applicability, to ensure that you only install updates on systems where they apply.<\/p>\n<p>The following table is for Windows 10 and Windows Server 2019+ versions.<\/p>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"8px\">\n<thead>\n<tr>\n<th>Product Version<\/th>\n<th colspan=\"2\">Cumulative Update<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr bgcolor=\"#F0F0F0\">\n<td><strong>Windows 10 1909<\/strong><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>.NET Framework 3.5, 4.8<\/td>\n<td><a href=\"http:\/\/www.catalog.update.microsoft.com\/Search.aspx?q=5003256\" rel=\"nofollow\">Catalog<\/a><\/td>\n<td><a href=\"https:\/\/support.microsoft.com\/kb\/5003256\" rel=\"nofollow\">5003256<\/a><\/td>\n<\/tr>\n<tr bgcolor=\"#F0F0F0\">\n<td><strong>Windows 10 1809 (October 2018 Update) and Windows Server 2019<\/strong><\/td>\n<td><\/td>\n<td><strong><a href=\"https:\/\/support.microsoft.com\/kb\/5003396\" rel=\"nofollow\">5003396<\/a><\/strong><\/td>\n<\/tr>\n<tr>\n<td>.NET Framework 3.5, 4.7.2<\/td>\n<td><a href=\"http:\/\/www.catalog.update.microsoft.com\/Search.aspx?q=5003258\" rel=\"nofollow\">Catalog<\/a><\/td>\n<td><a href=\"https:\/\/support.microsoft.com\/kb\/5003258\" rel=\"nofollow\">5003258<\/a><\/td>\n<\/tr>\n<tr>\n<td>.NET Framework 3.5, 4.8<\/td>\n<td><a href=\"http:\/\/www.catalog.update.microsoft.com\/Search.aspx?q=5003255\" rel=\"nofollow\">Catalog<\/a><\/td>\n<td><a href=\"https:\/\/support.microsoft.com\/kb\/5003255\" rel=\"nofollow\">5003255<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h5>Previous Monthly Rollups<\/h5>\n<p>The last few .NET Framework Monthly updates are listed below for your convenience:<\/p>\n<ul>\n<li><a href=\"https:\/\/devblogs.microsoft.com\/dotnet\/net-framework-may-2021-security-and-quality-rollup-updates\/\" rel=\"nofollow\">.NET Framework May 2021 Security and Quality Rollup Updates<\/a><\/li>\n<li><a href=\"https:\/\/devblogs.microsoft.com\/dotnet\/net-framework-february-2021-cumulative-update-preview-for-windows-10-2004-windows-server-version-2004-windows-10-version-20h2-and-windows-server-version-20h2\/\" rel=\"nofollow\">.NET Framework February 2021 Cumulative Update Preview for Windows 10 2004, Windows Server, version 2004, Windows 10, version 20H2 and Windows Server, version 20H2<\/a><\/li>\n<li><a href=\"https:\/\/devblogs.microsoft.com\/dotnet\/net-framework-february-2021-cumulative-update-preview-for-net-framework\/\" rel=\"nofollow\">.NET Framework February 2021 Cumulative Update Preview for .NET Framework.<\/a><\/li>\n<li><a href=\"https:\/\/devblogs.microsoft.com\/dotnet\/net-framework-february-security-and-quality-rollup\/\" rel=\"nofollow\">.NET Framework February Security and Quality Rollup<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Today, we are releasing the May 2021 Cumulative Update Preview for .NET Framework. Quality and Reliability This release contains the following quality and reliability improvements. CLR1 Addresses a performance issue caused by incorrect configuration in the GC. Addresses an issue where a background GC could pause the runtime for a long period of time if [&hellip;]<\/p>\n","protected":false},"author":369,"featured_media":58792,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[195,509],"tags":[],"class_list":["post-32984","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dotnet-framework","category-wpf"],"acf":[],"blog_post_summary":"<p>Today, we are releasing the May 2021 Cumulative Update Preview for .NET Framework. Quality and Reliability This release contains the following quality and reliability improvements. CLR1 Addresses a performance issue caused by incorrect configuration in the GC. Addresses an issue where a background GC could pause the runtime for a long period of time if [&hellip;]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/posts\/32984","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/users\/369"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/comments?post=32984"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/posts\/32984\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/media\/58792"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/media?parent=32984"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/categories?post=32984"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/tags?post=32984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}