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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-21

Last Modified

2026-05-22

Generated

2026-07-02

AI Q&A

2026-05-21

EPSS Evaluated

2026-06-30

NVD

CVE-2026-48207

EUVD

EUVD-2026-31292

Affected Vendors & Products

Vendor	Product	Version / Range
apache	fory	From 0.13.0 (inc) to 1.0.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-502	The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Attack-Flow Graph

Compliance Impact

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

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.

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