What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-11-10 · updated 2026-06-17
• Weakness: CWE-502

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.

Affected products

• Debian Linux: 11.0
• pdfminer.six: before 2025-11-07 — fixed in 2025-11-07

How to fix

Upgrade to a fixed version: pdfminer.six 2025-11-07. Check the vendor advisory for mitigations.

References

• https://github.com/pdfminer/pdfminer.six/commit/b808ee05dd7f0c8ea8ec34bdf394d40e63501086
• https://github.com/pdfminer/pdfminer.six/releases/tag/20251107
• https://github.com/pdfminer/pdfminer.six/security/advisories/GHSA-wf5f-4jwr-ppcp
• https://lists.debian.org/debian-lts-announce/2025/11/msg00017.html
• https://lists.debian.org/debian-lts-announce/2026/01/msg00005.html
• https://github.com/pdfminer/pdfminer.six/security/advisories/GHSA-wf5f-4jwr-ppcp

Get alerted when CVE-2025-64512 or the next vulnerability affects your stack