CVE-2025-70559
MEDIUM
GHSA-f83h-ghpp-7wcc
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
3Description
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.
Analysis
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. [CVSS 6.5 MEDIUM]
Technical Context
Classified as CWE-502 (Deserialization of Untrusted Data). Affects pdfminer.six. 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.
Affected Products
Product: pdfminer.six. Versions: up to 20251230.
Remediation
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
Priority Score
Vendor Status
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External POC / Exploit Code
Leaving vuln.today