Gotenberg - SSRF (CVE-2026-55229)

CVE-2026-55229 is a high-severity server-side request forgery (SSRF) vulnerability in Gotenberg versions prior to 8.34.0. A specially crafted document processed through the LibreOffice conversion endpoint can force the service to retrieve external HTTP(S) resources or local files, enabling blind SSRF attacks and limited local file disclosure.

CrowdSec has been tracking this vulnerability and its exploits since 17th of September 2026.

CrowdSec network observations suggest that most exploitation of CVE-2026-55229 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2026-55229. While still present in the wild, exploitation levels have dropped noticeably week-over-week. This may signal that the vulnerability is becoming less relevant or that defenses are improving fast enough for attackers to lose interest.

Attackers target the /forms/libreoffice/convert endpoint by uploading a crafted DOCX containing external relationships that reference local files or remote URLs. Successful exploitation may cause LibreOffice to fetch and embed these resources in a generated PDF, enabling limited local file disclosure or blind SSRF.