CVE-2026-106164 Progress Software CVE debrief

Who should care

Defenders responsible for environments using Telerik Document Processing Libraries, especially those using versions prior to 2026.3.1006, should assess exposure and prioritize verification and potential upgrades.

Why it matters

CVE-2026-106164 is a high-severity vulnerability in Progress Software's Telerik Document Processing Libraries that can lead to denial of service. Defenders should prioritize verifying exposure, especially in environments using versions prior to 2026.3.1006, and assess the need for an upgrade to a fixed version.

• Denial of service due to infinite loop
• Potential for CPU thread unresponsiveness
• Need for verification of exposure in environments
• Priority for upgrading to a fixed version

Technical summary

The Telerik Document Processing SpreadProcessing library, versions prior to 2026.3.1006, contains an infinite loop vulnerability when importing an XLS file with a specifically targeted corruption. This results in an unresponsive CPU thread and denial of service. The vulnerability is triggered by a specifically targeted corruption in the XLS file, which causes the import process to enter an infinite loop, leading to a denial of service. The affected product deployments should be verified, and an upgrade to a fixed version should be assessed. The CVE record and source item provide details on the vulnerability, but additional information from Progress Software and other sources may be necessary to fully understand

Defensive priority

Defenders should prioritize verifying exposure in their environments, especially those using Telerik Document Processing Libraries versions prior to 2026.3.1006, and assess the need for an upgrade to a fixed version.

Recommended defensive actions

• Verify exposure in environments using Telerik Document Processing Libraries versions prior to 2026.3.1006
• Assess the need for an upgrade to a fixed version
• Monitor for potential denial-of-service attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, but additional information from Progress Software and other sources may be necessary to fully understand the impact and mitigation strategies.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.