Vulnerability details

CVE-2026-48207

Apache Software Foundation Apache Fory

Apache Fory: PyFory ReduceSerializer Incomplete Policy Enforcement

CVSS 3.1

9.8Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.8Critical	3.1	CISA ADP / Vulnrichment (CISA-ADP)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
Apache Software Foundation	Apache Fory	0.13.0 ≤ v < 1.0.0	CVEProject cvelistV5 (CNA)

References and advisories

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Details

Published: 2026-05-21
Last updated: 2026-05-21
State: Published
Assigner (CNA): apache

Exploit prediction (EPSS)

0.57%

Probability of exploitation in 30 days

47.6%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-502
Deserialization of Untrusted Data