CVE-2026-106164: Infinite Loop in Telerik Document Processing XLS Import

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-07 · updated 2026-10-08
Weakness: CWE-835

Description

In Progress® Telerik® Document Processing SpreadProcessing library, versions prior to 2026.3.1006, an infinite loop vulnerability exists when importing an XLS file with a specifically-targted corruption, the import timeout is ignored resulting in an unresponsive CPU thread and denial of service.

Affected products

Progress Software Telerik Document Processing Libraries: from 2026.3.811 before 2026.3.1006 — fixed in 2026.3.1006

How to fix

Upgrade to a fixed version: Progress Software Telerik Document Processing Libraries 2026.3.1006. Check the vendor advisory for mitigations.

References

https://www.telerik.com/document-processing-libraries/documentation/knowledge-base/kb-security-import-infinite-loop-cve-2026-106164

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