CVE-2026-42597: Thecodingmachine Gotenberg

Medium severity, CVSS 5.9. EPSS: 0.4% chance of exploitation in the next 30 days.

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the /forms/chromium/convert/url and /forms/chromium/screenshot/url routes accept url=file:///tmp/... from anonymous callers. The default Chromium deny-list intentionally exempts file:///tmp/ so HTML/Markdown routes can load their own request-local assets, and those routes apply a per-request AllowedFilePrefixes guard to scope the read. The URL routes never set AllowedFilePrefixes, so the scope guard silently skips. Alice enumerates /tmp/, walks Gotenberg's per-request working directories, and reads the raw source files of other in-flight conversions as rendered PDF output. This vulnerability is fixed in 8.32.0.

Affected products

• Thecodingmachine Gotenberg: before 8.32.0 (fixed in 8.32.0)

Published 2026-05-14. Last modified 2026-06-17.