CVE-2026-14865
Awaiting Analysis Awaiting Analysis - Queue

Denial of Service in Progress Telerik UI for AJAX

Publication date: 2026-07-22

Last updated on: 2026-07-22

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:
Percentile:

Meta Information

Published
2026-07-22
Last Modified
2026-07-22
Generated
2026-07-22
AI Q&A
2026-07-22
EPSS Evaluated
N/A
NVD
CVE-2026-14865
EUVD
EUVD-2026-47698

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
progress telerik_ui_for_aspnet_ajax to 2026.2.708 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
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

AI Quick Actions

Instant insights powered by AI
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.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-14865. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart