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The vulnerability, CVE-2025-XXXX, stems from a flaw in the mechanism picklescan uses to identify unsafe modules during the deserialization process. The scanner maintains a denylist of dangerous global module names (e.g., ‘os’, ‘subprocess’, ‘asyncio’). However, it only performs an exact string match against this list. An attacker can bypass this protection by crafting a pickle payload that imports a submodule (e.g., ‘asyncio.unix_events’) of a denylisted parent module. Since the scanner does not recursively check if the imported module is a child of a dangerous module, it incorrectly marks the malicious payload as safe. Consequently, when this manipulated pickle object is deserialized, the unsafe submodule is successfully loaded, leading to arbitrary code execution.
Platform: Python Package
Version: <=0.0.30
Vulnerability: Bypass
Severity: Critical
date: 2025-09-17
Prediction: 2025-09-24
What Undercode Say:
`pip show picklescan`
`python -c “import picklescan; print(picklescan.__version__)”`
`python -m picklescan scan malicious.pkl`
How Exploit:
`python exploit.py malicious.pkl`
`import picklescan; target.scan(‘payload.pkl’)`
`payload = b”’cos…unix_events…”’`
Protection from this CVE:
Update to >=0.0.31
Avoid untrusted pickles
Use json/serialization
Impact:
Arbitrary Code Execution
Bypass Security Controls
System Compromise
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Sources:
Reported By: github.com
Extra Source Hub:
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