CVE-2025-64512

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-502

Affected software

Vendor	Product	Versions
pdfminer	pdfminer.six	< 20251107

References

https://github.com/pdfminer/pdfminer.six/commit/b808ee05dd7f0c8ea8ec34bdf394d40e63501086Patch
https://github.com/pdfminer/pdfminer.six/releases/tag/20251107Release Notes
https://github.com/pdfminer/pdfminer.six/security/advisories/GHSA-wf5f-4jwr-ppcpExploit, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/11/msg00017.htmlMailing List
https://lists.debian.org/debian-lts-announce/2026/01/msg00005.html
https://github.com/pdfminer/pdfminer.six/security/advisories/GHSA-wf5f-4jwr-ppcpExploit, Vendor Advisory

Timeline

Published: Nov 10, 2025
Last modified: Jun 17, 2026
NVD status: Modified

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