🛡️ CVE-2025-71339 — picklescan

🟠 CVSS 8.1 — High ✅ No Known Exploit CWE-502 NVD
8.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Picklescan is vulnerable to RCE through missing detection when calling numpy.f2py.crackfortran._eval_length

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2025-71339 is classified as CWE-502: Deserialization of Untrusted Data. Serialised data from an untrusted source is reconstructed into objects, which can trigger code during the process.

Affected software

CVE-2025-71339 is recorded against 2 packages.

  • picklescan (fixed in 0.0.33)
  • unknown

Timeline and source

Published on 30 December 2025 and last revised on 18 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Advisory)
github.com (Package)
github.com (Web)
github.com (Web)
pypi.org (Web)
www.vulncheck.com (Web)

Details

Severity High
CVSS Score 8.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE CWE-502
Public Exploit ✅ No
Source NVD
Published 2025-12-30
Updated 2026-08-12
Modified 2026-07-18
Fix URL N/A

Affected Packages

Software From version Fixed in
picklescan — 0.0.33
unknown — —

Similar Threats

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