CVE-2026-6022Network attack vector

Disk exhaustion via unbounded chunk reassembly

Published Apr 22, 2026 · Updated Apr 22, 2026

Uncontrolled resource consumption in Telerik UI for ASP.NET AJAX before 2026.1.421 allows remote attackers to exhaust server disk space. The RadAsyncUpload handler writes successive chunks to its temporary file without comparing the existing file size plus the incoming chunk against MaxFileSize. The default network-reachable handler is enabled even when an application does not use RadAsyncUpload, and repeated oversized uploads can fill its disk and interrupt service.

CVSS severity7.5
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Telerik UI for ASP.NET AJAX before 2026.1.421 allows remote attackers to exhaust server disk space. The RadAsyncUpload handler writes successive chunks to its temporary file without comparing the existing file size plus the incoming chunk against MaxFileSize. The default network-reachable handler is enabled even when an application does not use RadAsyncUpload, and repeated oversized uploads can fill its disk and interrupt service.

The record

CVE
CVE-2026-6022
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
Progress Software Corporation
Product
Telerik UI for ASP.NET AJAX
Classifications
CWE-400, CAPEC-572, T1499.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2011.2.712 <2026.1.421

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Progress Software Corporation · Telerik UI for ASP.NET AJAXversion=2011.2.712 <2026.1.421

Published CVSS scores

7.5Progress Software CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CAPEC-572Artificially Inflate File Sizes
T1499.001OS Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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