GitHub Advisoryadvisory · PyPI

GHSA-m5gw-83w2-7749 Apache Fory PyFory Deserialization of Untrusted Data

CRITICAL Published 2026-05-21 Modified 2026-06-30 Official page ↗
Aliases
CVE-2026-48207
Ecosystem
PyPI
Packages
pyfory
Severity
Critical
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-502
Reviewed
2026-06-30

Affected packages

• PyPI pyfory: >= 0.13.0, < 1.0.0 → fixed in 1.0.0

Description

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.

Related

Alias · CVE (1)

  • CVE-2026-48207 Deserialization of untrusted data in Apache Fory PyFory. vulnerability

Weakness · CWE (1)

  • CWE-502 Deserialization of Untrusted Data weakness

References