Vulnerability · Published Aug 11, 2025 · Assigned by GitHub_M

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

High 8.6

In plain English

A high-severity server-side request forgery in Stirling-PDF from Stirling-Tools. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.2% (higher than 83% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei.

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)2.2%top 17.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Nuclei

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Stirling-Tools	Stirling-PDF	< 1.1.0

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

References

https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-ff33-grr6-rmvp x_refsource_CONFIRM
https://github.com/Stirling-Tools/Stirling-PDF/commit/7d6b70871bad2a3ff810825f7382c49f55293943 x_refsource_MISC