CVE-2025-70559Public exploit

Local code execution via unsafe CMap deserialization

Published Feb 3, 2026 · Updated Feb 3, 2026

Insecure deserialization in pdfminer.six before 20251230 allows local users to execute code through a malicious CMap cache file. CMapDB._load_data in pdfminer/cmapdb.py reads a gzip-compressed .pickle.gz file and passes its contents to pickle.loads without validating trust or type. Exploitation requires write access to a directory in CMAP_PATH and a more-privileged process to load the named CMap, after which code runs with that process's privileges.

CVSS severity7.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure deserialization in pdfminer.six before 20251230 allows local users to execute code through a malicious CMap cache file. CMapDB._load_data in pdfminer/cmapdb.py reads a gzip-compressed .pickle.gz file and passes its contents to pickle.loads without validating trust or type. Exploitation requires write access to a directory in CMAP_PATH and a more-privileged process to load the named CMap, after which code runs with that process's privileges.

The record

CVE
CVE-2025-70559
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8GitHubCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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