6.5Medium
CVE-2026-33438Stirling-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.
Weakness (CWE):
CWE-770
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| stirling | stirling pdf | 2.1.5 – < 2.5.2 | |
| Stirling-Tools | Stirling-PDF | >= 2.1.5, < 2.5.2 |
References and patches
- https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-3932-2rfq-87xm ExploitVendor Advisory
CPE matches (NVD) (1)
cpe:2.3:a:stirling:stirling_pdf:*:*:*:*:*:*:*:*≥ 2.1.5 < 2.5.2