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TI-2025-34843 Aliases CVE-2025-55161

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

Priority HIGH 75CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.02196 82nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Stirling-PDF (Stirling-Tools): 1.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Stirling-ToolsStirling-PDFbefore 1.1.01.1.0Patch availableCNA
  • Stirling-PDF VendorStirling-Tools Affected before 1.1.0 Fixed in 1.1.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:stirlingpdf:stirling_pdf:*:*:*:*:*:*:*:*before 1.1.0VulnerableStirlingpdf
  • cpe:2.3:a:stirlingpdf:stirling_pdf:*:*:*:*:*:*:*:* Versions before 1.1.0 Vulnerable ·Stirlingpdf

Remediation

  • Fix · CNA Stirling-PDF (Stirling-Tools) Fixed in 1.1.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-55161

References

Exploit 1

Patch 1

  • TI-2025-34834 Stirling-PDF SSRF vulnerability on /api/v1/convert/file/pdf CVSS 3.1CRITICAL 9.8
  • TI-2025-34833 Stirling-PDF SSRF vulnerability on /api/v1/convert/html/pdf CVSS 3.1CRITICAL 9.8
  • TI-2026-74445 Code injection in Stirling-PDF via H2 database import CVSS 3.1CRITICAL 9.1
  • TI-2025-29281 Stirling-PDF Server-Side Request Forgery (SSRF)-Induced Arbitrary File Read Vulnerability CVSS 4.0HIGH 7.7
  • TI-2026-76934 Stirling-PDF H2 SQL denylist bypass allows Java method execution CVSS 4.0HIGH 8.6
  • TI-2026-41398 Stirling-PDF: Internal Service Account API Key Disclosure via Pipeline Endpoint CVSS 3.1HIGH 8.5
See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences