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  5. GHSA-6556-fwc2-fg2p

GHSA-6556-fwc2-fg2p: Picklescan is vulnerable to RCE through missing detection when calling numpy.f2py.crackfortran._eval_length

December 30, 2025

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

References

  • github.com/advisories/GHSA-6556-fwc2-fg2p
  • github.com/mmaitre314/picklescan
  • github.com/mmaitre314/picklescan/commit/70c1c6c31beb6baaf52c8db1b6c3c0e84a6f9dab
  • github.com/mmaitre314/picklescan/pull/53
  • github.com/mmaitre314/picklescan/releases/tag/v0.0.33
  • github.com/mmaitre314/picklescan/security/advisories/GHSA-6556-fwc2-fg2p

Code Behaviors & Features

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Affected versions

All versions before 0.0.33

Fixed versions

  • 0.0.33

Solution

Upgrade to version 0.0.33 or above.

Impact 8.1 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Learn more about CVSS

Weakness

  • CWE-502: Deserialization of Untrusted Data
  • CWE-94: Improper Control of Generation of Code ('Code Injection')

Source file

pypi/picklescan/GHSA-6556-fwc2-fg2p.yml

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