CVE-2025-62703
High · 8.8Fugue is Vulnerable to Remote Code Execution by Pickle Deserialization via FlaskRPCServer
CVSS
8.8
EPSS
0.7%
Published
Nov 25, 2025
CISA due date
—
The record
The Fugue framework implements an RPC server system for distributed computing operations. In the core functionality of the RPC server implementation, I found that the _decode() function in fugue/rpc/flask.py directly uses cloudpickle.loads() to deserialize data without any sanitization. This creates a remote code execution vulnerability when malicious pickle data is processed by the RPC server.The vulnerability exists in the RPC communication mechanism where the client can send arbitrary serialized Python objects that will be deserialized on the server side, allowing attackers to execute arbitrary code on the victim's machine.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| PyPI | fugue | 0 | No fix |
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