Release History

Progress® Telerik® Report Server 2026 Q3 (12.2.26.1007)

October 8, 2026

Faster document generation with reduced memory usage

NEW

• Telerik Reporting now delivers improved memory efficiency and faster report document generation, especially for reports with complex layouts and large data sets

Localization support for report content in the Web Report Designer

NEW

• The Web Report Designer now supports localized report content for multilingual audiences. Report authors can define and edit language-specific strings, switch the active language safely, and preview localized reports directly in the designer. Read more here.

Configurable export options in Telerik web report viewers

NEW

• Web report viewers now expose export format options so users can configure supported output settings before exporting. The options are supplied consistently by the Reporting REST service and are available in the supported web viewers and Report Server integrations. Read more here.

Faster and more scalable Report Server Manager

NEW

• Report Server Manager now loads and responds faster as the number of reports, revisions, scheduled tasks, and generated documents grows. Optimized data access reduces unnecessary storage operations and improves scalability across Windows and Linux environments

What's Improved

NEW

• Reports containing Table and Crosstab items now process faster while using less memory.
• Telerik web report viewers now use Kendo SVG icons for improved rendering and customization.
• PDF documents can now be rendered with font kerning applied by enabling the "ApplyKerning" export option. Read more here.
• The Reporting engine now parses HtmlTextBox content faster.
• The Reporting engine now renders reports with nested groups and page breaks faster.
• PictureBox alternative text can now be included while other report items are excluded from accessible PDF output.
• Declarative TRDX and TRDP report definitions now support the "Error" event.
• The TableGroup.GroupKeepTogether property now keeps group headers with their first data row.
• PictureBox now uses image rotation metadata to display images in the correct orientation. Read more here.
• Report authors can now exclude individual report items from accessible documents. Read more here.

What's Changed

CHANGED

• The TableGroup.GroupKeepTogether property now uses the GroupKeepTogether enum instead of a Boolean value.
• CSV export now excludes hidden report items by default unless "RespectItemVisibility" is disabled. Read more here.

Report Server

FIXED

• Remediated Security Vulnerability (CVE-2026-106145).
• Remediated Security Vulnerability (CVE-2026-106155).

Desktop Designer

FIXED

• The "Expression Editor" inserts an incorrect field expression for nested DateTime members when connected to Report Server.
• CsvDataSource header names do not update when "The CSV has headers" is toggled.

Web Designer

FIXED

• The PictureBox sizing settings are ignored when its contents are rendered on the design surface.
• HtmlTextBox indentation from the "Indent" button is applied twice and saved as encoded text.
• The Table of Contents "Title" property does not update immediately after editing.
• The Query Builder relationship editor displays a white "Edit" button.
• Chart wizard controls are not labeled for assistive technologies.
• The data-field menu does not open near the top edge of the table wizard.
• Content in the PictureBox "Value" property editor is misaligned.

Installation

FIXED

• The Telerik Reporting installer adds the legacy ASP.NET WebForms Report Viewer assembly to the Global Assembly Cache (GAC).

Paging

FIXED

• The "Index was outside the bounds of the array" error occurs in the WinUI Report Viewer when changing pages or view mode.
• Repeatable table group headers and footers do not render for nested items.

Rendering

FIXED

• Text in Indian scripts is rendered incorrectly in image and PDF output when using the Skia graphics engine.

CSV Rendering

FIXED

• Tables in "Report Header" and "Report Footer" sections are missing.

Engine Common

FIXED

• Table of Contents titles cannot be localized in report definitions.

Server .NET REST API

FIXED

• HTTP 403 is returned when anti-forgery validation rejects a restart request.

Server Manager .NET

FIXED

• "Configure new agent" dialog generates an invalid appsettings.json configuration snippet.
• "Access Tokens" view does not explain how access tokens are used.

Server REST API

FIXED

• Reports containing subreports cannot be previewed by guest users in an external viewer.

Preview

FIXED

• Graph legends and labels are corrupted when reports use the ar-SA culture.
• Form controls are missing accessible labels for screen readers.