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

What is CVE-2025-64512?

CVE-2025-64512 is a high-severity unsafe deserialization vulnerability in Debian Debian Linux, published on 10 Nov 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-502

Which versions are affected by CVE-2025-64512?

3 open source packages ship an affected version, including pdfminer-six and pdfminer.six. It affects 2 products.

Products include Debian Debian Linux, Pdfminer Pdfminer.six.

How do I fix CVE-2025-64512?

Upgrade pdfminer-six to 20251107 or later.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2025-64512 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-64512 exists.

Public exploit code: 10 proofs of concept on GitHub.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2025-64512, DLA-4374-1, DSA-6062-1, GHSA-wf5f-4jwr-ppcp, PYSEC-2026-1762, ROOT-APP-PYPI-CVE-2025-64512 and 3 more.