CVE-2025-71339
Picklescan is vulnerable to RCE through missing detection when calling numpy.f2py.crackfortran._eval_length
Impact
### 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 ```python 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 - [ac0d3r](https://github.com/ac0d3r) - [Tong Liu](https://lyutoon.github.io), Institute of information engineering, CAS
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | picklescan | < 0.0.33 | 0.0.33 |
Affected products
| Product | Affected versions |
|---|---|
| Picklescan | before 0.0.33 |
Versions were read from the advisory text. No structured product data has been published for this record yet.
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-6556-fwc2-fg2p
- https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-numpy-f2py-crackfortran-eval-length-gadget
- https://github.com/advisories/GHSA-6556-fwc2-fg2p
- https://github.com/mmaitre314/picklescan/pull/53
- https://github.com/mmaitre314/picklescan/commit/70c1c6c31beb6baaf52c8db1b6c3c0e84a6f9dab
- https://github.com/mmaitre314/picklescan/releases/tag/v0.0.33
- https://nvd.nist.gov/vuln/detail/CVE-2025-71339
- https://github.com/mmaitre314/picklescan
- https://github.com/pypa/advisory-database/tree/main/vulns/picklescan/PYSEC-2026-1783.yaml
- https://pypi.org/project/picklescan