CVE-2026-42589

Gotenberg exposes an unauthenticated RCE via the /forms/pdfengines/metadata/write endpoint. The root cause is that JSON metadata keys are passed to ExifTool without validation; a newline in a key allows injection of ExifTool flags (e.g., -if), enabling arbitrary code execution as the Gotenberg pr...

CVE-2026-42589 Gotenberg: Unauthenticated RCE via ExifTool Metadata Key Injection

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, Gotenberg's /forms/pdfengines/metadata/write HTTP endpoint accepts a JSON metadata object and passes its keys directly to ExifTool via the go-exiftool library. No validation is performed on key characters. A \n embedded i...