CVE-2026-110636 [CRITICAL] – pypdftk through 0.5 contains an OS command injection vulnerability in fill_form(), dump_da

pypdftk through 0.5 contains an OS command injection vulnerability in fill_form(), dump_data_fields(), and pdftk_cmd_util() that builds shell commands from caller-supplied paths. Attackers controlling pdf_path or out_file can inject shell metacharacters interpreted by subprocess.Popen with shell=True to execute OS commands as the Python process.