What’s Vulnerable › Vulnerabilities

CVE-2025-61622: Apache Fory, Apache Fory: Python RCE via unguarded pickle fallback serializer in pyfory

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 45.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-01 · updated 2026-10-09
• Weakness: CWE-502

Description

Deserialization of untrusted data in python in pyfory versions 0.12.0 through 0.12.2, or the legacy pyfury versions from 0.1.0 through 0.10.3: allows arbitrary code execution. An application is vulnerable if it reads pyfory serialized data from untrusted sources. An attacker can craft a data stream that selects pickle-fallback serializer during deserialization, leading to the execution of `pickle.loads`, which is vulnerable to remote code execution. Users are recommended to upgrade to pyfory version 0.12.3 or later, which has removed pickle fallback serializer and thus fixes this issue.

Affected products

• Apache Software Foundation Apache Fory: from 0.1.0 through 0.10.3; from 0.12.0 through 0.12.2

References

• https://lists.apache.org/thread/vfn9hp9qt06db5yo1gmj3l114o3o2csd
• http://www.openwall.com/lists/oss-security/2025/09/29/3

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