Vulnerability · Published Nov 10, 2025 · Assigned by GitHub_M
CVE-2025-64512pdfminer.six vulnerable to Arbitrary Code Execution via Crafted PDF Input
High 8.6
In plain English
A high-severity unsafe deserialization in pdfminer.six from pdfminer. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | pdfminer | 20221105+dfsg-1.1~deb12u1 | DSA-6062-1 |
| Debian:12 | pdfminer | 20221105+dfsg-1.1~deb12u1 | DEBIAN-CVE-2025-64512 |
| Debian:13 | pdfminer | 20221105+dfsg-1.1~deb13u1 | DSA-6062-1 |
| Debian:13 | pdfminer | 20221105+dfsg-1.1~deb13u1 | DEBIAN-CVE-2025-64512 |
| Debian:14 | pdfminer | 20221105+dfsg-1.1 | DEBIAN-CVE-2025-64512 |
| PyPI | pdfminer-six | 20251107 | GHSA-wf5f-4jwr-ppcp |
| PyPI | pdfminer-six | 20251107 | PYSEC-2026-1762 |
| Ubuntu:25.10 | pdfminer | no fix listed | UBUNTU-CVE-2025-64512 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| pdfminer | pdfminer.six | < 20251107 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References
- https://github.com/pdfminer/pdfminer.six/security/advisories/GHSA-wf5f-4jwr-ppcp x_refsource_CONFIRM
- https://github.com/pdfminer/pdfminer.six/commit/b808ee05dd7f0c8ea8ec34bdf394d40e63501086 x_refsource_MISC
- https://github.com/pdfminer/pdfminer.six/releases/tag/20251107 x_refsource_MISC
- https://lists.debian.org/debian-lts-announce/2025/11/msg00017.html
- https://lists.debian.org/debian-lts-announce/2026/01/msg00005.html