Server-Side Request Forgery (SSRF) in gotenberg - CVE-2026-55229
Published: November 9, 2026
Vulnerability identifier: #VU162919
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55229
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to cause Gotenberg to issue server-side HTTP(S) requests to attacker-controlled destinations.
The vulnerability exists due to automatic external resource retrieval by LibreOffice when processing crafted DOCX documents under Gotenberg's default configuration. An unauthenticated remote attacker can upload a document containing an external image reference to /forms/libreoffice/convert and trigger an outbound request during conversion.
Affected software
gotenberg
How to mitigate CVE-2026-55229
Install security update from vendor's website.
gotenberg - update to 8.34.0