# CVE-2026-106137: ClassFactory Race Condition and Retained Assembly Memory in Telerik UI for ASP.NET MVC

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

In affected versions of Progress® Telerik® UI for ASP.NET MVC `2012.2.710` through `2026.3.811`, ClassFactory updates a shared class dictionary without exclusive write protection and emits non-collectible dynamic assemblies that remain loaded for the AppDomain's lifetime. The dictionary lookup and insertion are not atomic, and case variations in aggregate descriptors can produce distinct retained types even though member resolution is case-insensitive. An unauthenticated remote attacker can exploit this if the application exposes an aggregation endpoint that is reachable without authentication, by submitting concurrent or repeated crafted requests. These requests may corrupt dictionary state or increase CPU and memory use, potentially degrading availability. The issue is fixed in version `2026.3.1015`.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Progress Software / Telerik UI for ASP.NET MVC: ≥ 2012.2.710; < 2026.3.1015 (affected, custom). Source: CNA: ProgressSoftware

## Severity and prioritization

- CVSS 3.1: 8.6 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H; source: CNA: ProgressSoftware

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-362, CWE-401

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.telerik.com/aspnet-mvc/documentation/knowledge-base/kb-security-class-factory-cve-2026-106137 (CNA: ProgressSoftware; vendor-advisory)

## Provenance

- CNA: ProgressSoftware: https://www.cve.org/CVERecord?id=CVE-2026-106137; retrieved 2026-11-11; source updated 2026-11-11

Revision: d7116126bf628b77fe97fdb3c32947158cf010c46a7873f4381df4d793de3c5c

Canonical: https://y2.dev/cve/CVE-2026-106137

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