CVE-2026-40280 Details.
Gotenberg <= 8.30.1 - Server Side Request Forgery
Atlas does not check this one. Needs an outside server.
To test for this one, the site would have to contact a server outside your network and report back. Atlas does not run checks that need that, so it does not run this one.
About CVE-2026-40280. What It Means.
Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, the default private-IP deny-lists for the --webhook-deny-list and --api-download-from-deny-list flags use a case-sensitive regular expression (^https?://) to match URL schemes. Because Go's net/url.Parse() normalizes the scheme to lowercase before establishing the outbound TCP connection, an attacker can bypass the deny-list by simply capitalizing part of the URL scheme (e.g., HTTP://, HTTPS:…
Affected Product. What Is Hit.
- Vendor
- thecodingmachine
- Product
- Thecodingmachine Gotenberg
FAQ
Common Questions.
Gotenberg <= 8.30.1 - Server Side Request Forgery. Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, the default private-IP deny-lists for the --webhook-deny-list and --api-download-from-deny-list flags use a case-sensitive regular expression (^https?://) to match URL schemes. Because Go's net/url.Parse() normalizes the scheme to lowercase before establishing the outbound TCP connection, an attacker can bypass the deny-list by simply capitalizing part of the URL scheme (e.g., HTTP://, HTTPS:…
No. To test for this one, the site would have to contact a server outside your network and report back. Atlas does not run checks that need that, so it does not run this one. The facts about CVE-2026-40280 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-40280 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update Thecodingmachine Gotenberg to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-40280. Atlas does not run a check for it, so nothing here says whether a particular site is affected.