CVE-2025-62703Public exploit

Remote code execution via unsafe pickle deserialization

Published Nov 25, 2025 · Updated Nov 26, 2025

Unsafe deserialization in Fugue 0.9.2 and earlier allows remote attackers to execute arbitrary code through a network-bound RPC server. The _decode() function in fugue/rpc/flask.py passes client-supplied serialized objects directly to cloudpickle.loads(), which reconstructs attacker-controlled Python objects. Exploitation requires FlaskRPCServer to bind to a reachable network interface; successful requests run code with the server process's privileges.

CVSS severity8.8
High
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Fugue 0.9.2 and earlier allows remote attackers to execute arbitrary code through a network-bound RPC server. The _decode() function in fugue/rpc/flask.py passes client-supplied serialized objects directly to cloudpickle.loads(), which reconstructs attacker-controlled Python objects. Exploitation requires FlaskRPCServer to bind to a reachable network interface; successful requests run code with the server process's privileges.

The record

CVE
CVE-2025-62703
Published
Nov 25, 2025
Updated
Nov 26, 2025
Vendor
The Fugue Project
Product
Fugue
Classifications
CWE-502, T1190
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 0.9.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Fugue Project · Fugueversion=<= 0.9.2

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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