CVE-2026-33438

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...

CVE-2026-33438

Stirling-PDF is affected by a Denial of Service (DoS) vulnerability in the watermark endpoint. Affected versions are 2.1.5 through 2.5.1 (prior to 2.5.2). An authenticated user can trigger resource exhaustion and server crashes by sending extreme values for fontSize and widthSpacer to /api/v1/sec...