CVE-2026-118040: Improper Signature and Certificate Validation in Telerik Document Processing Libraries RadPdfProcessing

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-28 · updated 2026-10-28
Weakness: CWE-295

Description

In Progress® Telerik® Document Processing Libraries prior to version 2026.3.1027, improper verification of cryptographic signatures and improper certificate validation in RadPdfProcessing digital signature validation allow an unauthenticated attacker to cause signature validation to report forged content as unmodified and its signing certificate as valid via a crafted signed PDF document.

Affected products

Progress Software Telerik Document Processing Libraries: before 2026.3.1027 — fixed in 2026.3.1027

How to fix

Upgrade to a fixed version: Progress Software Telerik Document Processing Libraries 2026.3.1027. Check the vendor advisory for mitigations.

References

https://docs.telerik.com/devtools/document-processing/knowledge-base/kb-security-improper-verification-of-cryptographic-signature-cve-2026-118040

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