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Vulnerability record · CVE-2026-42596 · published 14 May 2026

CVE-2026-42596: Thecodingmachine gotenberg server-side request forgery (ssrf) vulnerability

Thecodingmachine · Gotenberg

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.

9.4 CVSS 3.1 Critical EPSS 1.8% · top 22.7% CWE-918 · Server-side request forgery (SSRF)
9.4CVSS 3.1 base score
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h ExploitMitigationVendor Advisory
https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-42596), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.