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VulnerabilityPublished

CVE-2026-6022: Progress Software Telerik UI for ASP.NET AJAX · Uncontrolled Resource Consumption

Affects Progress Software Telerik UI for ASP.NET AJAXSource CVE Database V5

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Not known to be exploited · CVSS 7.5 High : upgrade to 2026.1.421 soon.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2026.1.421
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade Progress Software Telerik UI for ASP.NET AJAX to 2026.1.421.

Affected software

ProductAffectedFixed in
Progress SoftwareTelerik UI for ASP.NET AJAXAffected
  • >=2011.2.712 <2026.1.421
Fixed in
  • 2026.1.421
NuGettelerik.ui.for.aspnet.ajaxpkg:nuget/telerik.ui.for.aspnet.ajaxOther threatsAffected
  • =2011.2.712
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, consider implementing upload size monitoring and limiting mechanisms at network or application firewall levels to detect and block abnormal upload patterns. Review and restrict access to the RadAsyncUpload component where possible to reduce exposure.

Description

CVE-2026-6022 is a high-severity vulnerability in Progress Software's Telerik UI for ASP. NET AJAX prior to version 2026.1.421. The RadAsyncUpload component improperly enforces file upload size limits during chunk reassembly, allowing attackers to upload files exceeding the configured maximum size. This uncontrolled resource consumption can lead to disk space exhaustion on the affected system. No known exploits are reported in the wild. The vulnerability impacts availability but does not affect confidentiality or integrity.

References

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