CVE-2026-42597
Gotenberg allows Chromium URL conversion routes to read arbitrary files under /tmp via file:// scheme
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/gotenberg/gotenberg/v8 | <= 8.31.0 | 8.32.0 |
| go | github.com/gotenberg/gotenberg/v7 | <= 7.10.2 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Thecodingmachine | Gotenberg | before 8.32.0 |