PT-2026-38382 · Document Foundation+1 · Libreoffice+1
Kakarotsec
·
Published
2026-05-07
·
Updated
2026-06-25
·
CVE-2026-42591
CVSS v3.1
8.2
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N |
Name of the Vulnerable Software and Affected Versions
Gotenberg versions 8.31.0 and earlier
Description
A Server-Side Request Forgery (SSRF) issue exists in the LibreOffice conversion endpoint "/forms/libreoffice/convert". While some SSRF hardening is present in the Go code, the application passes uploaded documents directly to LibreOffice without inspecting their content. Because LibreOffice is a separate process that manages its own HTTP connections via libcurl, it bypasses the Go-level filters. An attacker can use OOXML formats (such as
.docx, .docm, .xlsx, .xlsm, .pptx, .pptm, .odt, .ods, .odp, or .rtf) containing embedded external image references with TargetMode="External" to force the server to make outbound HTTP requests. This can be used to access internal services, retrieve cloud metadata from http://169.254.169.254/, or perform internal network port scanning.Recommendations
Run LibreOffice with
unshare --net to remove all network access from the subprocess.
Scan uploaded OOXML files for rels/*.rels entries containing TargetMode="External" and validate or strip those URLs before processing the file with LibreOffice.Exploit
Fix
SSRF
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Gotenberg
Libreoffice