What is CVE-2026-42591?

CVE-2026-42591 is a high-severity vulnerability in Gotenberg, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.2/10. Published 2026-05-14.

How severe is CVE-2026-42591?

High severity. CVSS v3 base score is 8.2 out of 10.

SSRF in Gotenberg

CVE-2026-42591

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the LibreOffice conversion endpoint (/forms/libreoffice/convert) passes uploaded documents directly to LibreOffice without inspecting their content. LibreOffice then fetches any embedded external URLs on its own, completely bypassing the SSRF filters. This vulnerability is fixed in 8.32.0.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2026-05-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (26.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001

Affected products

Gotenberg — versions < 8.32.0
Thecodingmachine Gotenberg

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/gotenberg/gotenberg/security/advisories/GHSA-rm4c-xj6x-49mw (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42591?: CVE-2026-42591 is a high-severity vulnerability in Gotenberg, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.2/10. Published 2026-05-14.
How severe is CVE-2026-42591?: High severity. CVSS v3 base score is 8.2 out of 10.