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.

How to fix CVE-2025-70559

To remediate CVE-2025-70559, upgrade the affected package to a fixed version below.

• —upgrade to 20200726-1+deb11u2 or later
• —upgrade to 20200726-1+deb11u2 or later
• —upgrade to 20251230 or later

Is CVE-2025-70559 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 20200726-1+deb11u2
• from 0, < 20200726-1+deb11u2
• from 0, < 20251230

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2025-70559
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2025-70559
• PATCHgithub.com/pdfminer/pdfminer.six
• WEBgithub.com/pdfminer/pdfminer.six/commit/b808ee05dd7f0c8ea8ec34bdf394d40e63501086