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.
References
| Link | Resource |
|---|---|
| https://fory.apache.org/security/#cve-2026-48207-pyfory-reduceserializer-deserializationpolicy-bypass | Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/05/21/10 | Mailing List Third Party Advisory |
Configurations
History
22 May 2026, 12:40
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Apache
Apache fory |
|
| References | () https://fory.apache.org/security/#cve-2026-48207-pyfory-reduceserializer-deserializationpolicy-bypass - Vendor Advisory | |
| References | () http://www.openwall.com/lists/oss-security/2026/05/21/10 - Mailing List, Third Party Advisory | |
| CPE | cpe:2.3:a:apache:fory:*:*:*:*:*:*:*:* |
21 May 2026, 19:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
21 May 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 9.8 |
21 May 2026, 17:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-21 17:16
Updated : 2026-05-22 12:40
NVD link : CVE-2026-48207
Mitre link : CVE-2026-48207
CVE.ORG link : CVE-2026-48207
JSON object : View
Products Affected
apache
- fory
CWE
CWE-502
Deserialization of Untrusted Data