CVE-2026-48207: apache software foundation apache fory Deserialization of Untrusted Data

Vulnerability summary

CVE-2026-48207 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in apache software foundation apache fory. EPSS estimates a 0.82% chance of exploitation in the next 30 days, higher than 56.3% of scored vulnerabilities.

Timeline

1. 21-05-2026
   PublishedVulnerability first disclosed.
2. 21-05-2026
   Last modifiedVulnerability information updated.

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.

• CWE-502Deserialization of Untrusted DataThe product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.