Released: May 20, 2026

Updates in 2026 Q2 (2026.2.519)

Features

• Common:
  • Added new SegmentedControl component.
  • Updated Telerik Document Processing Library (DPL) version to 2026.2.519.
• Editor:
  • ImageManager and RadFileExplorer now support .avif, .heif, .heic and .webp file extensions.
  • Added the ability to resize the table columns and rows with the mouse in the content area.
  • Improved the StripJavaScriptUris content filter.
• Input:
  • Added password textbox with show/hide feature.
• ListBox:
  • Allows lazy loading of images with design-time templates.
• Navigation:
  • Added Separator feature to the RadNavigation control.
• PdfProcessing:
  • Handled import of documents with missing/invalid rectangle (re) operands.
  • Handled invalid ASCII85Decode filter scenario - PDF streams where the end-of-data marker contains whitespace.
  • Added import-export support for ShadingType 1.
  • Added import-export support for ShadingType 4.
  • Added import-export support for ShadingType 6.
  • Added import-export support for ShadingType 7.
  • Exposed internal GrayColor object.
  • Introduced support for signing multiple Signature fields.
• SpreadProcessing:
  • Cell rotation is now respected when exporting the workbook to PDF.
  • Introduced calculation chain functionality.
• WordsProcessing:
  • Introduced support for the Markdown file format, allowing import/export from/to markdown format.
  • TxtFormatProvider: Introduced support for export of Lists.

Fixes

• Common:
  • Fixed 500 "The cryptographic operation has failed" when loading combined resource URLs with EnableHandlerEncryption after URL rebuild.
  • Fixed 404 on combined resource URL when EnableHandlerEncryption is enabled - URL exceeds max length due to plaintext length check.
  • Fixed JS error when hovering a menu after partial postback when a RadButton is in an UpdatePanel and the Telerik.Web.UI.WebResource.axd URL is encrypted.
  • Fixed "The cryptographic operation has failed!" error when showing a hidden control and there is RadStyleSheetManager and EnableHandlerEncryption=true.
• AsyncUpload:
  • Fixed issue where RadAsyncUpload "Drop Files here" element remains visible when dragging a file quickly over and out of the DragZone.
• CheckBox:
  • Fixed issue where screen readers announce "checked/ not checked" when CheckBox feature is disabled.
• ColorPicker:
  • Fixed broken web palette layout - first column misaligned from the rest (Lightweight renderer).
  • Fixed issue where zooming breaks the colorpicker.
  • Fixed issue where the colorpicker pallet is corrupted in Firefox with different Windows Screen zoom levels.
• DateRangePicker:
  • Fixed issue where RadDateRangePicker method set_rangeSelectionStartDate and set_rangeSelectionEndDate are not working as expected.
• Editor:
  • Fixed issue after pasting from MS Word, where StripSpan does not work until a mode change to HTML and back to Design.
• Grid:
  • Fixed issue where scrolling on a mobile (touch) device is impossible with the Lightweight RenderMode when an HTML element takes up the entire grid row.
  • Fixed issue where the Grid's Horizontal scrollbar is not visible in iOS when the grid is empty.
• NumericTextBox:
  • Fixed issue where the ShowSpinButtons and Right Alignment cause the number to disappear behind the spinners.
• Rating:
  • Fixed issue where ratings are not working with body margin 0.
• TabStrip:
  • Fixed issue where the tab text is not being read by the screen reader.
  • Fixed accessibility issues for RadTabStrip and RadMultiPageView.
  • Fixed issue when keyboard navigation is enabled Tabs keep focus even after focusing other tabs.
  • Fixed issue where focus highlighting in TabStrip is not working properly with Keyboard Navigation.
• ToggleButton:
  • Fixed issue where icons in RadToggleButton disappear when using ConfirmSettings.
• PdfProcessing:
  • Fixed issue where a NullReferenceException is thrown when exporting a document with a Type 3 font with missing/invalid Unicode mapping.
  • PdfStreamWriter: Fixed issue regarding duplicated page content due to incorrect caching mechanism.
  • PdfStreamWriter: Fixed slow performance during page splitting.
  • SkiaImageFormatProvider: Fixed issue where NullReferenceException is thrown when exporting pages containing images with missing optional ColorSpace.
  • Fixed issue where XMP metadata is unescaped during import-export.
  • Fixed issue where document password cannot be resolved when document produced by the library contains a SignatureField.
  • Fixed issue where hidden PDF layers are imported as visible.
  • Fixed issue where an invalid PDF document is exported when inserting a specific Jpeg image with an ICC profile.
  • Fixed issue where a password is asked although Adobe opens the document without one.
  • Fixed CryptographicException because MD5 not available on Blazor WASM.
  • Fixed corrupted document when exporting Courier New subset.
  • NetStandard: Fixed missing content due to empty glyph outlines in embedded TrueType font subsets.
• SpreadProcessing:
  • Fixed issue where pasting a range in filtered rows overwrites their content.
  • Fixed issue where formatting string #.##0,00;-#.##0,00;;@ does not hide zero values.
  • Fixed issue where images don't move with cells when a row/column is inserted.
  • Fixed issue when setting value in a cell, where certain strings are recognized as dates instead of as text.
  • PdfFormatProvider: Fixed NotSupportedException: 'No imaging component suitable to complete this operation was found.'.
  • PdfFormatProvider: Fixed NullReferenceException when exporting PatternFill with PatternType.DiagonalStripe.
  • Fixed slow import for files with a lot of formulas.
• WordsProcessing:
  • Fixed issue where font of a style is changed on RTF import when the font is not explicitly defined in the style, and default character properties have font defined or is missing altogether.
  • HtmlFormatProvider: Fixed issue where styles are not correctly preserved when a bold tag is applied to the same styled element.