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…

PriorityP336medium6.5CVSS 3.1

AVNACLPRLUINSUCNINAH

EPSS

0.40%

31.6th percentile

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

2 ranges

Vendor	Product	Version range	Fixed in
stirling-tools	stirling-pdf	—	—
stirling	stirling_pdf	>= 2.1.5 < 2.5.2	2.5.2

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