CVE-2025-64512
pdfminer.six vulnerable to Arbitrary Code Execution via Crafted PDF Input
- Published
- Nov 10, 2025
- Updated
- Jan 8, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:HLow · next 30 days
- Percentile
- 24.2%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
10- CVE-2025-64512Exploit
CLI wrapper for CVE-2025-64512 PoC generating malicious PDF and pickle.gz payloads to exploit insecure deserialization in pdfminer.six, enabling remote code execution via crafted PDF processing.
A Proof-of-Concept for CVE-2025-64512 using a polyglot file.
Responsible use
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