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PYSEC-2026-1783

MediumCVSS 6.7 / 10
Published Jul 7, 2026·Last modified Jul 7, 2026
Affected Components(1)
PyPI logopicklescan
< 0.0.33
Description

Summary

Picklescan uses the numpy.f2py.crackfortran._eval_length function (a NumPy F2PY helper) to execute arbitrary Python code during unpickling.

Details

Picklescan fails to detect a malicious pickle that uses the gadget numpy.f2py.crackfortran._eval_length in __reduce__, allowing arbitrary command execution when the pickle is loaded. A crafted object returns this function plus attacker‑controlled arguments; the scan reports the file as safe, but pickle.load() triggers execution.

PoC

class PoC:
    def __reduce__(self):
        from numpy.f2py.crackfortran import _eval_length
        return _eval_length, ("__import__('os').system('whoami')", None)

Impact

  • Arbitrary code execution on the victim machine once they load the “scanned as safe” pickle / model file.
  • Affects any workflow relying on Picklescan to vet untrusted pickle / PyTorch artifacts.
  • Enables supply‑chain poisoning of shared model files.

Credits

Risk Scores
Base Score
6.7

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights.

Threat Intelligence
4.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.30%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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