CRITICAL 9.8

GHSA-m5gw-83w2-7749

Apache Fory PyFory Deserialization of Untrusted Data

Details

Fory 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.

Are you affected?

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Affected packages

PyPI / pyfory

Introduced in: 0.13.0 Fixed in: 1.0.0

Fix pip install --upgrade 'pyfory>=1.0.0'

References

https://nvd.nist.gov/vuln/detail/CVE-2026-48207 [ADVISORY]
https://fory.apache.org/security/#cve-2026-48207-pyfory-reduceserializer-deserializationpolicy-bypass [WEB]
https://github.com/apache/fory [PACKAGE]
http://www.openwall.com/lists/oss-security/2026/05/21/10 [WEB]