# CVE-2026-106154: Progress Telerik UI for ASP.NET Core uncontrolled recursion in FilterParser

Source: https://junglewise.ai/threats/cve-2026-106154-in-progress-telerik-ui-for-asp-net-core-versions-2015-1-318  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-12. Updated: 2026-11-12  
License: CC BY 4.0 with a link back

CVE-2026-106154 · Severity: high · CVSS 8.6 · Published 2026-11-12

Progress Telerik UI for ASP.NET Core is a component library used to build web applications. An unauthenticated attacker can send specially crafted filter parameters to exposed endpoints, causing the server to crash with a stack overflow exception and making the application unavailable.

Vendors: [Progress](https://junglewise.ai/threats/vendors/progress).

## Quick answers

**Is CVE-2026-106154 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-106154 being exploited in the wild.

**How severe is CVE-2026-106154?** High severity, with a CVSS score of 8.6, published 12 November 2026.

**Which products and versions are affected?** Progress Telerik UI for ASP.NET Core 2015.1.318 through 2026.3.1015.

**Is there a fix for CVE-2026-106154?** Yes: fixed in 2026.4.1111. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-106154 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-106154?** Check whether you run Progress Telerik UI for ASP.NET Core at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 2026.4.1111

## Technical details

The FilterParser component processes nested filter expressions from untrusted DataSourceRequest model binding without enforcing recursion depth limits, while FilterLexer lacks input-length validation. An unauthenticated remote attacker can exploit this via deeply nested filter parameters sent to any endpoint using DataSourceRequest that lacks authentication, triggering StackOverflowException and denial of service. A fix is available in version 2026.4.1111.

## Affected products

- Progress Telerik UI for ASP.NET Core 2015.1.318 through 2026.3.1015

## Timeline

- 2026-11-12: disclosed

## References

- [https://www.telerik.com/aspnet-core-ui/documentation/knowledge-base/kb-security-uncontrolled-recursion-cve-2026-106154](https://www.telerik.com/aspnet-core-ui/documentation/knowledge-base/kb-security-uncontrolled-recursion-cve-2026-106154)

## Related threats

- [Progress Telerik UI for ASP.NET Core memory exhaustion via aggregation requests](https://junglewise.ai/threats/cve-2026-106156-in-progress-telerik-ui-for-asp-net-core-versions-2015-1-318)