Is CVE-2026-106137 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-106137 being exploited in the wild.

How severe is CVE-2026-106137?

High severity, with a CVSS score of 8.6, published 11 November 2026.

Which products and versions are affected?

Progress Telerik UI for ASP.NET MVC 2012.2.710 through 2026.3.811.

Is there a fix for CVE-2026-106137?

Yes: fixed in 2026.3.1015. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-106137 attacked?

It is attacked over the network.

Am I affected by CVE-2026-106137?

Check whether you run Progress Telerik UI for ASP.NET MVC 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.

CVE-2026-106137: Progress Telerik UI for ASP.NET MVC class factory denial of service

CVE-2026-106137 · Severity: high · CVSS 8.6 · Published 2026-11-11

Progress Telerik UI for ASP.NET MVC is a framework that provides data aggregation and UI components for web applications. An unauthenticated attacker can send specially crafted concurrent requests to publicly accessible aggregation endpoints to corrupt internal data structures, causing excessive CPU and memory consumption that degrades application availability.

Vendors: Progress.

Quick answers

Is CVE-2026-106137 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-106137 being exploited in the wild.
How severe is CVE-2026-106137?: High severity, with a CVSS score of 8.6, published 11 November 2026.
Which products and versions are affected?: Progress Telerik UI for ASP.NET MVC 2012.2.710 through 2026.3.811.
Is there a fix for CVE-2026-106137?: Yes: fixed in 2026.3.1015. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-106137 attacked?: It is attacked over the network.
Am I affected by CVE-2026-106137?: Check whether you run Progress Telerik UI for ASP.NET MVC 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: 2026.3.1015

Technical details

The ClassFactory component fails to apply exclusive write protection when updating a shared class dictionary and emits non-collectible dynamic assemblies that persist for the application domain's lifetime. Case-insensitive member resolution combined with case-sensitive dictionary lookups allows attackers to create duplicate retained types through concurrent or repeated requests. An attacker reaching an unauthenticated aggregation endpoint can trigger race conditions causing memory exhaustion and CPU spikes.

Affected products

Progress Telerik UI for ASP.NET MVC 2012.2.710 through 2026.3.811

Timeline

2026-11-11: disclosed

References

https://www.telerik.com/aspnet-mvc/documentation/knowledge-base/kb-security-class-factory-cve-2026-106137

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