CVE-2026-33438 describes a Denial of Service (DoS) vulnerability in Stirling-PDF versions 2.1.5 through 2.5.1, specifically affecting its watermark functionality. An authenticated attacker can exploit this by providing extreme values for `fontSize` and `widthSpacer` parameters to the `/api/v1/security/add-watermark` endpoint, causing resource exhaustion and server crashes. This vulnerability has a CVSS score of 6.5 Medium, indicating a high impact on availability with low attack complexity and requiring low privileges. There is currently no evidence of active exploitation, public exploit code, or significant community attention for this issue.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.1.5, < 2.5.2CPE matchmatch criteria | cpe:2.3:a:stirling:stirling_pdf:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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