8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-62703

CVE-2025-62703: Fugue is Vulnerable to Remote Code Execution by Pickle Deserialization via FlaskRPCServer

Fugue is a unified interface for distributed computing that lets users execute Python, Pandas, and SQL code on Spark, Dask, and Ray with minimal rewrites. In version 0.9.2 and prior, there is a remote code execution vulnerability by pickle deserialization via FlaskRPCServer. 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. This issue has been patched via commit 6f25326.

(GitHub Advisory)

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CVE-2025-62703

CVE-2025-62703:

8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
fugue	pip	<= 0.9.2

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability exists because the Fugue RPC server, implemented using Flask, unsafely deserializes data received from clients. The analysis of the source code for fugue/rpc/flask.py confirms the vulnerability description. The _decode function uses cloudpickle.loads on user-controlled input without any validation or sanitization. An attacker can send a specially crafted, base64-encoded pickle object to the server. The FlaskRPCServer._invoke method, which handles incoming RPC calls, retrieves this payload from the request and passes it to _decode. When cloudpickle.loads deserializes the malicious payload, it executes the embedded code, leading to remote code execution on the server. The provided commit 6f25326779fd1f528198098d6287c5a863176fc0 only adds security warnings and does not patch the underlying deserialization vulnerability, which was confirmed by fetching the file content directly from the repository.

Vulnerable functions

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WAF Rule

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Reasoning

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