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.
Affected products
progress: telerik ui for asp.net ajax
References1
- www.telerik.com/products/aspnet-ajax/documentation/knowledge-ba… Vendor AdvisoryMitigation
Metrics
- CVSS 3.1
-
5.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - EPSS — exploit probability
- 0% percentile: 38 · as of 14 November 2026
- CWE
- CWE-776
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.