Gotenberg up to 8.31.x URL-to-PDF Endpoint url server-side request forgery

Summaryinfo

A vulnerability identified as critical has been detected in Gotenberg up to 8.31.x. This issue affects some unknown processing of the file /forms/chromium/convert/url of the component URL-to-PDF Endpoint. Performing a manipulation results in server-side request forgery. This vulnerability is cataloged as CVE-2026-42595. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Gotenberg up to 8.31.x. It has been classified as critical. This affects some unknown functionality of the file /forms/chromium/convert/url of the component URL-to-PDF Endpoint. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, Gotenberg's Chromium URL-to-PDF endpoint (/forms/chromium/convert/url) has no default protection against HTTP/HTTPS-based SSRF. The default deny-list regex only blocks file:// URIs. An unauthenticated attacker can point Chromium at any internal IP — including loopback, RFC 1918 ranges, and cloud metadata endpoints — and receive the response rendered as a PDF. Additionally, even when operators configure a custom deny-list, the protection is bypassed via HTTP redirects. Gotenberg's Chromium instance follows 302 redirects from an attacker-controlled external URL to internal targets without re-validating the redirect destination against the deny-list. This vulnerability is fixed in 8.32.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-42595 since 04/29/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 8.32.0 eliminates this vulnerability.

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Productinfo

Name

• Gotenberg

Version

• 8.0
• 8.1
• 8.2
• 8.3
• 8.4
• 8.5
• 8.6
• 8.7
• 8.8
• 8.9
• 8.10
• 8.11
• 8.12
• 8.13
• 8.14
• 8.15
• 8.16
• 8.17
• 8.18
• 8.19
• 8.20
• 8.21
• 8.22
• 8.23
• 8.24
• 8.25
• 8.26
• 8.27
• 8.28
• 8.29
• 8.30
• 8.31

Website

• Product: https://github.com/gotenberg/gotenberg/

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