CVE-2026-40281
CriticalSummary
Gotenberg is a stateless API for PDF files that in versions 8.30.1 and earlier improperly validates metadata values. These values can contain newline characters, allowing injection of arbitrary ExifTool pseudo-tags, leading to serious security vulnerabilities.
Risk Assessment
An unauthenticated attacker can rename or move PDF files in the container filesystem, overwrite arbitrary files, or create symlinks and hard links at arbitrary paths.
Recommendation
It is recommended to update Gotenberg to a version that fixes the validation of metadata values to prevent injection and file manipulation.
Original NVD description (English source)
Gotenberg is a Docker-powered stateless API for PDF files. In versions 8.30.1 and earlier, the metadata write endpoint validates metadata keys for control characters but leaves metadata values unsanitized. A newline character in a metadata value splits the ExifTool stdin line into two separate arguments, allowing injection of arbitrary ExifTool pseudo-tags such as -FileName, -Directory, -SymLink, and -HardLink. This is a bypass of the incomplete key-sanitization fix introduced in v8.30.1. An unauthenticated attacker can rename or move any PDF being processed to an arbitrary path in the container filesystem, overwrite arbitrary files, or create symlinks and hard links at arbitrary paths.