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CVE PROGRAM SOURCE RECORD6.5 Medium

CVE-2026-33438

Stirling-PDF vulnerable to DoS via add-watermark

Description

Stirling-PDF is a locally hosted web application that allows you to perform various operations on PDF files. Versions starting in 2.1.5 and prior to 2.5.2 have Denial of Service (DoS) vulnerability in the Stirling-PDF watermark functionality (`/api/v1/security/add-watermark` endpoint). The vulnerability allows authenticated users to cause resource exhaustion and server crashes by providing extreme values for the `fontSize` and `widthSpacer` parameters. Version 2.5.2 patches the issue.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Stirling-Tools Stirling-PDF

  • >= 2.1.5, < 2.5.2affected

References