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CVE-2026-48207 — Vulnerability in pyfory — CVE Details

CRITICAL

Apache Fory PyFory Deserialization of Untrusted Data

Published May 21, 2026Updated July 13, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published May 21, 2026 (144 days ago).
  • Last revised July 13, 2026 — 53 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update pyfory to 1.0.0 or later
pip install "pyfory>=1.0.0"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
pyfory
pypi
0.13.0, 0.13.1, 0.13.2, 0.14.0 (+4 more)1.0.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-48207?
Apache Fory PyFory Deserialization of Untrusted Data This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-48207?
CVE-2026-48207 affects pyfory. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-48207 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-m5gw-83w2-7749
PYSEC-2026-2984

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