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.
Metrics
Affected Vendors & Products
Advisories
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-f83h-ghpp-7wcc | Insecure Deserialization (pickle) in pdfminer.six CMap Loader — Local Privesc |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Wed, 04 Feb 2026 12:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Pdfminer
Pdfminer pdfminer.six |
|
| Vendors & Products |
Pdfminer
Pdfminer pdfminer.six |
Tue, 03 Feb 2026 18:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| References |
|
Projects
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Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2026-02-03T17:40:24.803Z
Reserved: 2026-01-09T00:00:00.000Z
Link: CVE-2025-70559
No data.
Status : Awaiting Analysis
Published: 2026-02-03T18:16:17.783
Modified: 2026-02-04T16:34:21.763
Link: CVE-2025-70559
No data.
OpenCVE Enrichment
Updated: 2026-02-04T12:17:27Z
Weaknesses
No weakness.
Github GHSA