CVE-2026-33438 Stirling-PDF vulnerable to DoS via add-watermark

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 vulnerabilit...