CVE-2025-62703

Fugue is Vulnerable to Remote Code Execution by Pickle Deserialization via FlaskRPCServer

Published Nov 25, 2025 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-xv5p-fjw5-vrj6 Fugue is Vulnerable to Remote Code Execution by Pickle Deserialization via FlaskRPCServer
History
Type Values Removed Values Added
First Time appeared Fugue-project
Fugue-project fugue
CPEs cpe:2.3:a:fugue-project:fugue:*:*:*:*:*:*:*:*
Vendors & Products Fugue-project
Fugue-project fugue
Type Values Removed Values Added
First Time appeared Fugue Project
Fugue Project fugue
Vendors & Products Fugue Project
Fugue Project fugue
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Fugue is Vulnerable to Remote Code Execution by Pickle Deserialization via FlaskRPCServer
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Nov 26, 2025, 3:59 PM
Reserved
Oct 20, 2025, 7:41 PM
Status
Analyzed
Published
Nov 25, 2025, 10:15 PM
Modified
Oct 19, 2026, 1:10 PM