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.
CVSS Details
- CVSS 3.1 Base Score: 8.6
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade pdfminer | Nov 20, 2025 | Nov 20, 2025 |
| Freebsd | — | Upgrade py314-pdfminer.sixUpgrade py311-pdfminer.sixUpgrade py310-pdfminer.sixUpgrade py313-pdfminer.sixUpgrade py312-pdfminer.sixUpgrade py313t-pdfminer.six | Dec 10, 2025 | Nov 17, 2025 |
| Suse | — | Upgrade python3-pdfminer.six | Dec 5, 2025 | Dec 5, 2025 |
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