CVE-2026-55229 PoC — Gotenberg: SSRF via LibreOffice document processing

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-55229.yaml

Associated Vulnerability

Title: Gotenberg: SSRF via LibreOffice document processing (CVE-2026-55229)
Description:Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.34.0, Gotenberg's /forms/libreoffice/convert endpoint allows a specially crafted document to cause LibreOffice to automatically retrieve external HTTP(S) resources and local file resources during document conversion, enabling blind SSRF and limited local file disclosure via linked image resource loading. This issue is fixed in version 8.34.0.

Description

Gotenberg before 8.34.0 allows SSRF and limited local file disclosure via its /forms/libreoffice/convert endpoint. When LibreOffice is used to convert user-uploaded DOCX files, external relationships within the document (such as a:blip r:link TargetMode="External") can instruct LibreOffice to fetch local resources (file://) or remote resources (http/https), which are then included as images in the generated PDF. This can disclose the contents of local files LibreOffice can open as images, or allow outbound requests to attacker-controlled endpoints. Version 8.34.0 disables resolution of external resources during document conversion to mitigate the vulnerability.

File Snapshot

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