SSRF in Gotenberg

CVE-2026-42596

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, the default deny-lists used by Gotenberg's downloadFrom feature and webhook feature are bypassable. Because the filter is regex-based and case-sensitive, an unauthenticated attacker can supply URLs such as http://[::ffff:127.0.0.1]:... and reach loopback or private HTTP services that the default deny-list is intended to block. This crosses a real security boundary because an external caller can force the server to make outbound requests to internal-only targets. This vulnerability is fixed in 8.31.0.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.018 (77.3th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-42596: rose from 0.004 to 0.018.

EPSS over last 30 days · oldest: 0.004 · newest: 0.018 · change: +0.014

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-42596?
CVE-2026-42596 is a critical-severity vulnerability in Gotenberg, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.4/10. Published 2026-05-14.
How severe is CVE-2026-42596?
Critical severity. CVSS v3 base score is 9.4 out of 10.