# CVE-2026-118040: Progress Telerik Document Processing signature validation bypass

Source: https://junglewise.ai/threats/cve-2026-118040-in-progress-telerik-document-processing-libraries-prior-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-118040 · Severity: high · CVSS 7.5 · Published 2026-10-28

Progress Telerik Document Processing Libraries is used by applications to process and validate digitally signed PDF documents. An attacker can craft a malicious PDF that bypasses signature validation, causing forged documents to appear authentic. This allows tampering with critical PDF content—such as contracts, financial records, or legal documents—without detection.

Technologies: [Progress Telerik Document Processing Libraries](https://junglewise.ai/threats/technologies/telerik-document-processing-libraries). Vendors: [Progress](https://junglewise.ai/threats/vendors/progress).

## Quick answers

**Is CVE-2026-118040 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-118040 being exploited in the wild.

**How severe is CVE-2026-118040?** High severity, with a CVSS score of 7.5, published 28 October 2026.

**Which products and versions are affected?** Progress Telerik Document Processing Libraries prior to 2026.3.1027.

**Is there a fix for CVE-2026-118040?** Yes: fixed in 2026.3.1027. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-118040 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-118040?** Check whether you run Progress Telerik Document Processing Libraries at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 2026.3.1027

## Technical details

The vulnerability is an improper verification of cryptographic signatures and certificate validation flaw (CWE-347, CWE-295) in the RadPdfProcessing digital signature validation component. An unauthenticated attacker with network access can submit a crafted signed PDF document to applications using the library; the validation logic will incorrectly report forged content as unmodified and the malicious signing certificate as valid. A fix is available in version 2026.3.1027 and later.

## Affected products

- Progress Telerik Document Processing Libraries prior to 2026.3.1027

## Timeline

- 2026-10-28: disclosed: CVE-2026-118040 published

## References

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

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