GHSA-m5gw-83w2-7749

Apache Fory PyFory Deserialization of Untrusted Data

Source: GitHub Advisory Database (reviewed) Critical CVE-2026-48207

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pyfory	>= 0.13.0, < 1.0.0	1.0.0

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.

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