CVE-2026-42596
CriticalSummary
Gotenberg is an API for PDF files that prior to version 8.31.0 had a vulnerability in the downloadFrom and webhook features. The default deny-lists were bypassable, allowing unauthenticated attackers to access internal HTTP services.
Risk Assessment
This vulnerability allows attackers to force the server to make outbound requests to internal resources, violating the organization's security.
Recommendation
It is recommended to update Gotenberg to version 8.31.0 or later to mitigate this vulnerability.
Other vulnerabilities in Gotenberg API
See all- CVE-2026-42594High
Gotenberg, a PDF file API, has a vulnerability prior to version 8.32.0 that can lead to process crashes. The issue arises from improper context management during concurrent requests, causing a panic in the webhook goroutine.
- CVE-2026-42591High
Gotenberg is a stateless API for PDF files that, prior to version 8.32.0, passed uploaded documents directly to LibreOffice without inspecting their content. LibreOffice then fetched any embedded external URLs on its own, completely bypassing SSRF filters.
- CVE-2026-42589Critical
Gotenberg is a PDF file API that, prior to version 8.31.0, did not validate keys in JSON objects sent to the /forms/pdfengines/metadata/write endpoint. Using a newline character in a JSON key allows for the injection of arbitrary ExifTool flags, leading to unauthenticated OS command execution.
- CVE-2026-40281Critical
Gotenberg is a stateless API for PDF files that in versions 8.30.1 and earlier improperly validates metadata values. These values can contain newline characters, allowing injection of arbitrary ExifTool pseudo-tags, leading to serious security vulnerabilities.
Original NVD description (English source)
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 data from NVD (NIST) · CISA KEV · EPSS