8.6

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-64512

CVE-2025-64512: pdfminer.six vulnerable to Arbitrary Code Execution via Crafted PDF Input

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.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-64512

CVE-2025-64512:

8.6

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
pdfminer.six	pip	< 20251107	20251107

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the pdfminer.six library's handling of CMap resources within PDF files. The CMapDB._load_data function is responsible for loading these resources, which are stored as pickled and gzipped files. The vulnerability arises because the function constructs a file path based on the /Encoding value in a PDF's font object, and this path was not properly validated. An attacker could craft a PDF with a malicious /Encoding value that points to an arbitrary file path on the system. When pdfminer.six processes this PDF, the _load_data function would attempt to open and deserialize the file at the specified path using pickle.loads(). Since Python's pickle module is not secure against deserializing untrusted data, this allows for arbitrary code execution. The provided patch confirms this analysis by adding path resolution and validation logic within the _load_data function to prevent directory traversal attacks, ensuring that only legitimate CMap files from the designated directory can be loaded.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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