CVE-2026-119343
Stirling-PDF: AI create-pdf-from-html-agent skips HTML sanitization enabling WeasyPrint SSRF and local file read
Stirling-PDF is a locally hosted web application that facilitates various operations on PDF files. Prior to 3.0.0, POST /api/v1/ai/tools/create-pdf-from-html-agent accepts attacker-controlled htmlContent and passes it to WeasyPrint without CustomHtmlSanitizer, unlike the sanitized /api/v1/convert/html/pdf control path. HTTP and HTTPS resource references can make server-side requests to internal or cloud-metadata destinations, while file references can embed local content readable by the Stirling-PDF process into the generated PDF. The endpoint is reachable without credentials when security.enableLogin is false, and the flaw is distinct from earlier Stirling-PDF WeasyPrint vulnerabilities in older conversion paths. This issue is fixed in version 3.0.0.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Stirling-PDF Stirling-Tools |
< 3.0.0 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.8 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N | CNA: GitHub_M |
Exploit evidence
- https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-3x7x-943g-269w
exploit · ADP: CISA-ADP
References
- https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-3x7x-943g-269wCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/Stirling-Tools/Stirling-PDF/pull/7018CNA: GitHub_M · x_refsource_MISC
- https://github.com/Stirling-Tools/Stirling-PDF/commit/0570c4c4d9e7bf4786a02ab770ef75f116ac3719CNA: GitHub_M · x_refsource_MISC
- https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v3.0.0CNA: GitHub_M · x_refsource_MISC
- https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-3x7x-943g-269wADP: CISA-ADP · exploit
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