Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 are missing `marshal` and `types` from the block list of unsafe module imports. Fickling started blocking both modules to address this issue. This allows an attacker to craft a malicious pickle file that can bypass fickling since it misses detections for `types.FunctionType` and `marshal.loads`. A user who deserializes such a file, believing it to be safe, would inadvertently execute arbitrary code on their system. This impacts any user or system that uses Fickling to vet pickle files for security issues. The issue was fixed in version 0.1.6.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-565g-hwwr-4pp3 Fickling has missing detection for marshal.loads and types.FunctionType in unsafe modules list
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 16 Dec 2025 00:45:00 +0000

Type Values Removed Values Added
Description Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 are missing `marshal` and `types` from the block list of unsafe module imports. Fickling started blocking both modules to address this issue. This allows an attacker to craft a malicious pickle file that can bypass fickling since it misses detections for `types.FunctionType` and `marshal.loads`. A user who deserializes such a file, believing it to be safe, would inadvertently execute arbitrary code on their system. This impacts any user or system that uses Fickling to vet pickle files for security issues. The issue was fixed in version 0.1.6.
Title Fickling has missing detection for marshal.loads and types.FunctionType in unsafe modules list
Weaknesses CWE-184
CWE-502
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-12-16T00:32:52.714Z

Reserved: 2025-12-11T18:08:02.947Z

Link: CVE-2025-67747

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2025-12-16T01:15:52.803

Modified: 2025-12-16T01:15:52.803

Link: CVE-2025-67747

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses