High · published November 10, 2025
⚠️ A sneaky pickle file could lead to arbitrary code execution! Before version 20251107, pdfminer.six trusted the wrong source, allowing malicious PDFs to load custom code—like a takeout order delivered to the wrong address that comes packed with a surprise! 🔥 Think of it like a seemingly harmless delivery to your doorstep that turns out to be a bomb—this vulnerability allows a malicious PDF to specify where its nasty surprises are hidden. Just as you wouldn’t want to receive an unexpected package, you definitely don’t want your software executing arbitrary code from a rogue source! An attacker could craft a malicious PDF to execute any code they desire, meaning they might steal sensitive data, corrupt files, or even take control of your system. This is absolutely devastating for any application relying on pdfminer.six for PDF processing!
Think of it like a seemingly harmless delivery to your doorstep that turns out to be a bomb—this vulnerability allows a malicious PDF to specify where its nasty surprises are hidden. Just as you wouldn’t want to receive an unexpected package, you definitely don’t want your software executing arbitrary code from a rogue source! The flaw lies in the `CMapDB._load_data()` function, which uses `pickle.loads()` to deserialize pickle files. Because the malicious PDF can specify an arbitrary directory, it can load and execute a malicious payload if it ends with `.pickle.gz`.
An attacker could craft a malicious PDF to execute any code they desire, meaning they might steal sensitive data, corrupt files, or even take control of your system. This is absolutely devastating for any application relying on pdfminer.six for PDF processing! Upgrade to version 20251107 or later of pdfminer.six immediately to patch this vulnerability. Additionally, review your application to ensure that you're not processing untrusted PDFs, as a best practice. Consider implementing additional input validation and sanitization for file handling. You’ve got this! With the right steps, you can keep your applications safe and sound. 🛡️