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EUVD-2026-318644

fkie_cve-2026-42593

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, pdfengines/merge, pdfengines/split, libreoffice/convert, chromium/convert/url, chromium/convert/html, and chromium/convert/markdown accept stampSource=pdf + stampExpression=/path and watermarkSource=pdf + watermarkExpression=/path from anonymous callers. The dedicated stamp/watermark routes require an uploaded file when the source type is image or pdf; these six routes only overwrite the expression when a file is uploaded, leaving the user-controlled path intact when no file is attached. pdfcpu opens the path and composites its pages onto the output PDF, which returns to the caller. An attacker reads any PDF the Gotenberg process can access on the container filesystem. This vulnerability is fixed in 8.32.0.

GHSA-3cv5-q585-h563 — Gotenberg has arbitrary PDF read via stampExpression and watermarkExpression in merge, split, and convert routes

Affected: Go: github.com/gotenberg/gotenberg/v8

## Summary

Six conversion routes (`pdfengines/merge`, `pdfengines/split`, `libreoffice/convert`, `chromium/convert/url`, `chromium/convert/html`, `chromium/convert/markdown`) accept `stampSource=pdf` + `stampExpression=/path` and `watermarkSource=pdf` + `watermarkExpression=/path` from anonymous callers. The dedicated stamp/watermark routes require an uploaded file when the source type is image or pdf; these six routes only overwrite the expression when a file is uploaded, leaving the user-controlled path intact when no file is attached. pdfcpu opens the path and composites its pages onto the output PDF, which returns to the caller. An attacker reads any PDF the Gotenberg process can access on the container filesystem.

## Details

The dedicated stamp route at `pkg/modules/pdfengines/routes.go:1322-1332` rejects requests missing the stamp file:

```go if stamp.Source == gotenberg.StampSourceImage || stamp.Source == gotenberg.StampSourcePDF { if stampFile == "" { return api.WrapError(errors.New("no stamp file provided"), ...) } stamp.Expression = stampFile } ```

The merge, split, LibreOffice, and Chromium routes use a lax pattern across twelve call sites (six stamp + six watermark):

```go // pkg/modules/pdfengines/routes.go:679-683 (merge), 803 (split); // pkg/modules/libreoffice/routes.go:307-311; // pkg/modules/chromium/routes.go:433-438, 508-513, 592-597 if (stamp.Source == gotenberg.StampSourceImage || stamp.Source == gotenberg.StampSourcePDF) && st…