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CVE-2025-67747

Trailofbits Fickling insecure deserialization

7.8 HIGHPublic exploitEPSS 0.28%
  1. Published16 Dec 2025

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.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Trailofbits Fickling< 0.1.6

Remediation

Fixed in
Trailofbits Fickling≥ 0.1.6

References

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Frequently asked

Is CVE-2025-67747 being actively exploited?

CVE-2025-67747 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.28%.

How severe is CVE-2025-67747?

CVE-2025-67747 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.28% probability of exploitation.

Which products are affected by CVE-2025-67747?

Affected products include Trailofbits Fickling.

How do I fix CVE-2025-67747?

Upgrade affected software to a fixed version, for example Trailofbits Fickling 0.1.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.