Stirling-PDF vulnerable to DoS via add-watermark_CVE-2026-33438

6.5 / 10

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Basic Information

ID CVE-2026-33438

Source GitHub_M

Published Mar 26, 2026 at 16:58

Modified Mar 26, 2026 at 17:34

Affected Product

Vendor Stirling-Tools

Product Stirling-PDF

Version >= 2.1.5, < 2.5.2

Affected Versions Stirling-Tools Stirling-PDF >= 2.1.5, < 2.5.2

CWE Classification

CWE-770

References

github.com /Stirling-Tools/Stirling-PDF/security/advisories/GHSA-3932-2rfq-87xm

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    "published": "2026-03-26T16:58:07.485Z",
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