Server-Side Request Forgery (SSRF) in gotenberg - CVE-2026-42591
Published: May 5, 2026
Vulnerability identifier: #VU129633
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-42591
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: thecodingmachine
Affected software:
gotenberg
gotenberg
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to server-side request forgery in the LibreOffice conversion endpoint when processing uploaded documents with embedded external URLs. A remote attacker can upload a specially crafted document to disclose sensitive information.
LibreOffice fetches embedded external references during document conversion, bypassing the SSRF hardening implemented for Go-handled outbound requests.
How to mitigate CVE-2026-42591
Install security update from vendor's website.