CVE-2026-48207
Undergoing Analysis Undergoing Analysis - In Progress
Deserialization Flaw in Apache Fory PyFory

Publication date: 2026-05-21

Last updated on: 2026-05-22

Assigner: Apache Software Foundation

Description
Deserialization of untrusted data in Apache Fory PyFory. PyFory's ReduceSerializer could bypass documented DeserializationPolicy validation hooks during reduce-state restoration and global-name resolution. An application is vulnerable if it deserializes attacker-controlled data using PyFory Python-native mode with strict mode disabled and relies on DeserializationPolicy to restrict unsafe classes, functions, or module attributes. This issue affects Apache Fory: from before 1.0.0. Mitigation: Users of Apache Fory are recommended to upgrade to version 1.0.0 or later, which enforces DeserializationPolicy validation for the affected ReduceSerializer paths and thus fixes this issue.
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Meta Information
Published
2026-05-21
Last Modified
2026-05-22
Generated
2026-06-11
AI Q&A
2026-05-21
EPSS Evaluated
2026-06-10
NVD
CVE-2026-48207
EUVD
EUVD-2026-31292
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
apache fory From 0.13.0 (inc) to 1.0.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
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Executive Summary

This vulnerability involves the deserialization of untrusted data in Apache Fory's PyFory component. Specifically, PyFory's ReduceSerializer can bypass the intended DeserializationPolicy validation hooks during the process of restoring reduce-state and resolving global names. This means that if an application deserializes data controlled by an attacker using PyFory's Python-native mode with strict mode disabled, and relies on DeserializationPolicy to restrict unsafe classes, functions, or module attributes, it could be vulnerable.

Impact Analysis

The impact of this vulnerability is that an attacker could potentially bypass security restrictions intended to prevent unsafe deserialization. This could allow the attacker to execute unauthorized code or manipulate application state by injecting malicious serialized data, leading to possible compromise of the application or its data.

Mitigation Strategies

Users of Apache Fory are recommended to upgrade to version 1.0.0 or later.

Version 1.0.0 enforces DeserializationPolicy validation for the affected ReduceSerializer paths and thus fixes this issue.

Compliance Impact

The provided information does not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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