What is CVE-2026-118040?

CVE-2026-118040 is a high-severity vulnerability in Progress Software Telerik Document Processing Libraries, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2026-10-28.

How severe is CVE-2026-118040?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Progress Software Telerik Document Processing Libraries

CVE-2026-118040

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.

Vulnerability class: Improper Certificate Validation

Published 2026-10-28 · last modified 2026-10-28.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Progress Software Telerik Document Processing Libraries

Weakness classification (CWE)

References

docs.telerik.com/devtools/document-processing/knowledge-base/kb-security-improp… (vendor-advisory)

Frequently asked questions

What is CVE-2026-118040?: CVE-2026-118040 is a high-severity vulnerability in Progress Software Telerik Document Processing Libraries, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2026-10-28.
How severe is CVE-2026-118040?: High severity. CVSS v3 base score is 7.5 out of 10.