Vulnerability · Published May 14, 2026 · Assigned by GitHub_M
CVE-2026-42593Gotenberg: Arbitrary PDF read via stampExpression and watermarkExpression in merge, split, and convert routes
Medium 5.3
In plain English
A medium-severity path traversal in gotenberg from gotenberg. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/gotenberg/gotenberg/v7 | no fix listed | GO-2026-5080 |
| Go | github.com/gotenberg/gotenberg/v8 | no fix listed | GHSA-3cv5-q585-h563 |
| Go | github.com/gotenberg/gotenberg/v8 | no fix listed | GO-2026-5080 |
Affected products (as reported)
Weakness: CWE-22, CWE-73 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- https://github.com/gotenberg/gotenberg/security/advisories/GHSA-3cv5-q585-h563 x_refsource_CONFIRM