CVE-2026-48207 Details
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.
A vulnerability exists in Apache Fory PyFory versions 0.13.0 prior to 1.0.0, allowing the ReduceSerializer to bypass DeserializationPolicy validation hooks. This deserialization of untrusted data can occur in Python-native mode with strict mode disabled. Applications are at risk if they deserialize attacker-controlled data and rely on DeserializationPolicy to limit unsafe classes, functions, or module attributes.
Users are advised to upgrade to Apache Fory PyFory version 1.0.0 or later, which enforces DeserializationPolicy validation for the affected ReduceSerializer paths. Libraries and applications that depend on Apache Fory should update their dependency requirements and release patched versions.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 21, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2026/05/21/10 | CVE | Mailing ListThird Party Advisory |
| https://fory.apache.org/security/#cve-2026-48207-pyfory-reduceserializer-deserializationpolicy-bypass | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-502 | Deserialization of Untrusted Data | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| apache fory | >= 0.13.0, < 1.0.0 |
CPE
Remediation
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Change History
7 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 22, 2026 | Initial Analysis | [email protected] |
| May 21, 2026 | CVE Modified | CVE |
| May 21, 2026 | CVE Modified | CISA-ADP |
| May 21, 2026 | New CVE Received | [email protected] |