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CVE-2025-61622

CriticalPublished

Apache Fory, Apache Fory: Python RCE via unguarded pickle fallback serializer in pyfory

Published: Oct 1, 2025
Updated: Nov 4, 2025
Assigning CNA: apache
Evidence observed: Aug 28, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

43.5%

Moderate · next 30 days

Percentile: 98.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Deserialization of untrusted data in python in pyfory versions 0.12.0 through 0.12.2, or the legacy pyfury versions from 0.1.0 through 0.10.3: allows arbitrary code execution. An application is vulnerable if it reads pyfory serialized data from untrusted sources. An attacker can craft a data stream that selects pickle-fallback serializer during deserialization, leading to the execution of `pickle.loads`, which is vulnerable to remote code execution. Users are recommended to upgrade to pyfory version 0.12.3 or later, which has removed pickle fallback serializer and thus fixes this issue.

Sources

cve_2025_61622_pocPoC
This PoC demonstrates the Remote Code Execution (RCE) vulnerability in Apache Pyfory (versions 0.12.0-0.12.2 and legacy PyFury 0.1.0-0.10.3) due to insecure pickle fallback deserialization (CVE-2025-61622).

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