Released: Jan 21, 2026

Updates in 2025 Q4 (2025.4.1321)

Features

• Common:
  • Updated Telerik Licensing minimal required version to 1.6.36.
  • Multiple accessibility and keyboard navigation improvements in multiple controls (RadListBox, OrgChart, TabStrip, Date/Time Pickers, MediaPlayer).
  • Telerik Document Processing: Introduced API for automatic file format detection.
• ListBox:
  • Added WAI-ARIA support for RadListBox.
• MediaPlayer:
  • Added Loop boolean property for video repeat support.
• OrgChart:
  • Added keyboard navigation and Section 508 accessibility support.
• PdfProcessing:
  • Handled documents with invalid byte offsets due to content added at the beginning of the file.
  • Introduced support for vertical alignment of table cells.
  • Handled the import of incrementally updated documents with invalid cross-reference offsets.
  • Handled the import of documents containing integers bigger than int.MaxValue.
  • Introduced API used to sign documents using only the end certificate of a certificate chain.
  • Introduced a mechanism for changing the Standard font when exporting a PDF/A Compliance document.
  • Handled import of documents with a negative cross-reference stream offset.
  • Handled the import of documents with invalid offset and no space before dictionary keys.
  • Added support for documents with an invalid stream cross-reference table.
  • Introduced support for Border annotation property.
  • Provided support for specifying the MIME type of embedded files.

Fixes

• Calendar:
  • Fixed issue where Date and Time Pickers show picker button on the wrong side in RTL with Bootstrap skin and Lightweight rendering.
• Docking:
  • Fixed issue where Dock width increases each time it is dropped with animation enabled.
• Editor:
  • Fixed issue where StripCssExpressions filter causes performance degradation.
  • Fixed issue where incorrect event args are passed to RadEditor OnClientCommandExecuting when RadTreeList is present on the page.
  • Fixed issue where PdfExportFilter filter strips the width attribute from table elements when switching to HTML mode.
• Grid:
  • Fixed issue where tableView.clearSort() does not remove sorted column visual state in client-side bound Grid.
• ListBox:
  • Fixed issue where RadListBox lacks visible keyboard focus and proper ARIA support.
  • Fixed issue where the required WAI-ARIA attributes are missing in RadListBox button area toolbar and buttons.
• PdfProcessing:
  • Fixed issue where a document with invalid cross-reference stream is not loaded correctly.
  • Fixed an InvalidOperationException: 'The signature was not properly initialized for external signing. The signing delegate is missing.'.
  • Fixed issue where re-saving a document with Acrobat throws an error due to invalid Info dictionary in document trailer.
  • Fixed issue where a MissingMethodException is thrown when converting PDF stream to PdfArray.
  • Fixed issue regarding mangled Right-To-Left (RTL) content when multiple lines of text are drawn.
  • Fixed issue where the font subset is not recalculated when you import-export a document and FontEmbeddingType.Subset set.
  • Fixed issue where some characters are not properly resolved from the Encoding differences table.
  • PdfStreamWriter: Fixed issue where InvalidOperationException is thrown when creating multi-page document with umlaut on the last page.
  • Fixed InvalidOperationException: 'isContentReleased' when exporting.
  • Fixed issue where the embedded font program is not consistent with the Widths entry of the font dictionary.
  • Fixed issue where CheckBoxWidget appearance is not correctly displayed when importing document with PdfProcessing.
• Splitter:
  • Fixed issue where dragging the SplitBar moves the whole page slightly on mobile devices.
  • Fixed issue where SplitBar does not move smoothly on mobile devices, only shifts a few pixels when dragged.
• SpreadStreamProcessing:
  • Fixed issue where files exported with SpreadStreamProcessing cannot be read by OleDB consumers.
• TabStrip:
  • Fixed issue where focused tab CSS class is not removed when clicking tabs with mouse after keyboard navigation.
• WordsProcessing:
  • Fixed issue where the w:multiLine property of a text content control is lost during import.
  • PdfFormatProvider: Fixed issue where tab stop distances are not calculated correctly when a hanging indent is applied.
  • HtmlFormatProvider: Fixed issue where a NullReferenceException is thrown when exporting a document that contains styles with no ParagraphMarkerProperties.
  • Fixed issue where content is moved to previous page after applying styling to the footer and exporting to PDF format.