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CVE-2025-55161 PoC — Stirling-PDF SSRF vulnerability on /api/v1/convert/markdown/pdf

Source
https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-55161.yaml
Associated Vulnerability
Title:Stirling-PDF SSRF vulnerability on /api/v1/convert/markdown/pdf (CVE-2025-55161)
Description:Stirling-PDF is a locally hosted web application that performs various operations on PDF files. Prior to version 1.1.0, when using the /api/v1/convert/markdown/pdf endpoint to convert Markdown to PDF, the backend calls a third-party tool to process it and includes a sanitizer for security sanitization which can be bypassed and result in SSRF. This issue has been patched in version 1.1.0.
Description
Stirling-PDF is a locally hosted web application that performs various operations on PDF files. Prior to version 1.1.0, when using the /api/v1/convert/markdown/pdf endpoint to convert Markdown to PDF, the backend calls a third-party tool to process it and includes a sanitizer for security sanitization which can be bypassed and result in SSRF.
File Snapshot

 id: CVE-2025-55161

info:
  name: Stirling-PDF SSRF via Markdown
  author: beginee
  severity: high


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