HighVulnerability

CVE-2025-62703: Fugue remote code execution through pickle deserialization in FlaskRPCServer

Source: NVD(opens in a new tab)
Identifier: CVE-2025-62703
Published: November 25, 2025
Record updated: October 9, 2026

Affected: fugue <= 0.9.2
Fixed in: No fixed version was stated when the source was last read.
Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.8%

Summary

CVE-2025-62703 affects Fugue, a unified distributed computing interface, in version 0.9.2 and prior. The _decode() function in fugue/rpc/flask.py passes data directly to cloudpickle.loads() without sanitization in the FlaskRPCServer, so a client can send serialized Python objects that the server deserializes, allowing arbitrary code execution on the server host.

Mitigation

This issue has been patched via commit 6f25326.

Details

Scores and exploitation

CVSS score: 8.8(high)
EPSS: 0.8%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 3, 2026.

Weaknesses and techniques

Weakness (CWE): CWE-502
Attack pattern (CAPEC): CAPEC-586
AI threat technique (MITRE ATLAS): AML.T0010

Affected

Packages: fugue@<= 0.9.2

Classification

Attack type: Supply chain
Attack sophistication: Moderate
AI component targeted: Framework
Impact: Confidentiality,
Integrity,
Availability
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2025-62703

First tracked: February 15, 2026 at 08:46 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 80% (self-assessed)

Summary

Mitigation

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