Ocr

How command injection happens in Python subprocess and how to fix it

A critical command injection vulnerability was discovered in `docling/models/stages/ocr/tesseract_ocr_cli_model.py`, where user-controlled inputs such as language identifiers, file paths, and the Tesseract executable path were passed directly into `subprocess.run()` calls without validation. An attacker who could influence these values — for example, by supplying a maliciously crafted document or configuration — could inject arbitrary shell arguments or commands. The fix introduces strict input