CVE-2025-64512

Pdfminer.six is a community maintained fork of the original PDFMiner, a tool for extracting information from PDF documents. Prior to version 20251107, pdfminer.six will execute arbitrary code from a malicious pickle file if provided with a malicious PDF file. The `CMapDB._load_data()` function in pdfminer.six uses `pickle.loads()` to deserialize pickle files. These pickle files are supposed to be part of the pdfminer.six distribution stored in the `cmap/` directory, but a malicious PDF can specify an alternative directory and filename as long as the filename ends in `.pickle.gz`. A malicious, zipped pickle file can then contain code which will automatically execute when the PDF is processed. Version 20251107 fixes the issue.

Affected products

Debian, Pdfminer.Six

Pdfminer Pdfminer.six

< 2025-11-07

Fix

Available

CVSS 3.1

8.6 HIGH

EPSS

0.3% (24th percentile)

Weakness

CWE-502

NVD status

Modified

Published

2025-11-10