AIKIDO-2026-669434
pdfminer.six is vulnerable to Deserialization of Untrusted Data
86
High Risk
This Affects:
pdfminer.sixTL;DR
CMapDB._load_data() deserializes CMap data with pickle.loads() from a .pickle.gz path derived from the PDF's encoding name, and that path is not confined to the package cmap/ directory. A crafted PDF can point at an attacker-controlled pickle (including a Windows network path), so processing the document executes arbitrary Python code under the pdfminer process. The fix stops loading attacker-influenced pickle paths for CMap data.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and process untrusted PDF files with pdfminer.
Background info
pdfminer.six is vulnerable to Deserialization of Untrusted Data in versions 20140915 - 20251229.
How to fix this
Upgrade the pdfminer.six and/or the pdfminer-six library to the patch version.
Links
GitHub Release
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