PYSEC-2026-2984
Apache Fory PyFory Deserialization of Untrusted Data
Quick fix
PYSEC-2026-2984 — pyfory: upgrade to the fixed version with the command below.
pip install --upgrade 'pyfory>=1.0.0'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?
Enter the version of the package you're using.
Affected packages
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]
- https://pypi.org/project/pyfory[PACKAGE]
- https://github.com/advisories/GHSA-m5gw-83w2-7749[ADVISORY]