CVE-2026-42596 Details
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.
A vulnerability in Gotenberg prior to version 8.31.0 allows for unauthenticated server-side request forgery (SSRF) by bypassing default deny-lists in the 'downloadFrom' and 'webhook' features. The regex-based, case-sensitive filters can be manipulated to access loopback or private HTTP services that are supposed to be blocked, enabling external callers to force the server to make outbound requests to internal-only targets.
Users are advised to update Gotenberg to version 8.31.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h | CISA-ADP | ExploitMitigationVendor Advisory |
| https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h | [email protected] | ExploitMitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| thecodingmachine gotenberg | < 8.31.0 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 18, 2026 | Initial Analysis | [email protected] |
| May 15, 2026 | CVE Modified | CISA-ADP |
| May 14, 2026 | New CVE Received | [email protected] |