CVE-2026-48207: Apache Fory

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Apache Fory: from 0.13.0, before 1.0.0 (fixed in 1.0.0)

Published 2026-05-21. Last modified 2026-07-23.