PT-2026-39661 · Gotenberg · Gotenberg

Ayushparkara · Published 2026-05-11 · Updated 2026-05-14 · CVE-2026-42595

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Gotenberg versions prior to 8.32.0

Description Gotenberg is a Docker-powered stateless API for PDF files. The Chromium URL-to-PDF endpoint '/forms/chromium/convert/url' lacks default protection against Server-Side Request Forgery (SSRF) for HTTP and HTTPS requests, as the default deny-list only blocks file:// URIs. This allows an unauthenticated attacker to direct Chromium to internal IP addresses, including loopback, RFC 1918 ranges, and cloud metadata endpoints, receiving the response rendered as a PDF. Additionally, the downloadFrom and webhook endpoints are also affected by a redirect-based bypass. Even when a custom deny-list is configured, the Chromium instance and other endpoints follow HTTP 302 redirects from attacker-controlled external URLs to internal targets without re-validating the destination against the deny-list.

Recommendations Update to version 8.32.0. As a temporary workaround, restrict access to the '/forms/chromium/convert/url' endpoint to minimize the risk of exploitation.

Exploit

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-42595

GHSA-CHWH-F6GM-R836

Affected Products

Gotenberg

References · 6

• 🔥 https://github.com/gotenberg/gotenberg/security/advisories/GHSA-chwh-f6gm-r836 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-42595 · Security Note
• https://osv.dev/vulnerability/GHSA-chwh-f6gm-r836 · Vendor Advisory
• https://github.com/gotenberg/gotenberg · Note
• https://twitter.com/KaitanSecurity/status/2054970020032036917 · Twitter Post
• https://t.me/CVEtracker/53795 · Telegram Post