CVE-2026-40281: 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…

PriorityP266critical9.1CVSS 3.1

AVNACLPRNUINSUCNIHAH

EPSS

0.61%

44.8th percentile

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
github.com	gotenberg_gotenberg_v8	>= 0 < 8.31.0	8.31.0
gotenberg	gotenberg	<= 8.30.1	—
thecodingmachine	gotenberg	< 8.31.0	8.31.0

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