CVE•Published 2026-05-14•Modified 2026-05-18•1 article on news•6 live references•NVD data

CVE-2026-42596Thecodingmachine · Gotenberg

Vulnerability data via NVD (ingested)

CVSS v3.1

9.4

CRITICAL

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

EPSS percentile

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Weaknesses (CWE)

CWE-918Server-Side Request Forgery (SSRF)

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.

Timeline

Published 2026-05-14

Modified 2026-05-18

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-42596

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Thecodingmachine Gotenberg"

All exposed Thecodingmachine Gotenberg instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Gotenberg"

HTTP body or banner mentions "Gotenberg" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-42596