Medium severity6.5OSV Advisory· Published Feb 3, 2026· Updated Apr 15, 2026
CVE-2025-70559
CVE-2025-70559
Description
pdfminer.six before 20251230 contains an insecure deserialization vulnerability in the CMap loading mechanism. The library uses Python pickle to deserialize CMap cache files without validation. An attacker with the ability to place a malicious pickle file in a location accessible to the application can trigger arbitrary code execution or privilege escalation when the file is loaded by a trusted process. This is caused by an incomplete patch to CVE-2025-64512.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pdfminer.sixPyPI | < 20251230 | 20251230 |
Affected products
2- Range: 20160614, 20170419, 20170720, …
Patches
Vulnerability mechanics
References
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