CVE-2025-62703: fugue Insecure Deserialization

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.

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CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-502 Deserialization of Untrusted Data

Affected Products

Vendor	Product	Versions
fugue-project	fugue	< 0.9.1

References

Advisories & Patches

https://github.com/fugue-project/fugue/commit/6f25326779fd1f528198098d6287c5a863176fc0 https://github.com/fugue-project/fugue/security/advisories/GHSA-xv5p-fjw5-vrj6 https://github.com/fugue-project/fugue/security/advisories/GHSA-xv5p-fjw5-vrj6

Exploits

https://github.com/fugue-project/fugue/security/advisories/GHSA-xv5p-fjw5-vrj6 https://github.com/fugue-project/fugue/security/advisories/GHSA-xv5p-fjw5-vrj6

Frequently Asked Questions

What is CVE-2025-62703? +

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. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-62703? +

CVE-2025-62703 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-62703? +

CVE-2025-62703 affects products from fugue-project, specifically: fugue. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-62703? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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