CVE-2026-14865

Analyzed Analyzed - Analysis Complete

Denial of Service in Progress Telerik UI for AJAX

Publication date: 2026-07-22

Last updated on: 2026-08-06

Assigner: Progress Software Corporation

Description

In Progress® Telerik® UI for AJAX prior to v2026.2.708, the internal LayoutBuilder control processes client-state XML without disabling DTD processing, allowing unauthenticated denial of service via recursive XML entity expansion.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-22

Last Modified

2026-08-06

Generated

2026-08-11

AI Q&A

2026-07-22

EPSS Evaluated

2026-08-10

NVD

CVE-2026-14865

EUVD

EUVD-2026-47698

Affected Vendors & Products

Vendor	Product	Version / Range
progress	telerik_ui_for_asp.net_ajax	From 2009.31314 (inc) to 2026.2.708 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-776	The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.

Attack-Flow Graph

Executive Summary

This vulnerability affects Progress Telerik UI for ASP.NET AJAX versions before v2026.2.708. It involves the undocumented LayoutBuilder control processing XML from client state without disabling DTD processing. Attackers can exploit this via malicious XML with recursive entity definitions, causing exponential memory consumption and server denial of service.

Detection Guidance

Check for the presence of the LayoutBuilder control in your ASP.NET AJAX application by searching for the <telerik:LayoutBuilder> tag in page markup files. Monitor server logs for excessive memory usage or denial-of-service conditions during XML processing.

Impact Analysis

The impact is limited to denial of service through internal entity expansion. Servers using vulnerable versions may experience crashes or slowdowns due to memory exhaustion from recursive XML processing. The attack requires no authentication and targets the LayoutBuilder control if explicitly used in page markup.

Compliance Impact

This vulnerability primarily causes denial-of-service conditions via XML entity expansion, which may lead to service unavailability. It does not directly expose or leak data, so its impact on compliance like GDPR or HIPAA is likely minimal unless service disruption affects data processing or availability requirements.

Mitigation Strategies

Upgrade to Progress Telerik UI for AJAX v2026.2.708 or later. If immediate upgrade is not possible, remove the LayoutBuilder control from affected pages as a workaround.

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