Apache Pyfory python is vulnerable to deserialization of untrusted data
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | pyfory | >= 0.12.0, < 0.12.3 | 0.12.3 |
| Python (PyPI) | pyfury | >= 0.1.0, <= 0.10.3 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-61622
- https://github.com/apache/fory/pull/2629
- https://github.com/apache/fory/commit/379b948ecae5c3b849e5bdb3997978c9a163e40b
- https://github.com/apache/fory
- https://github.com/apache/fory/releases/tag/v0.12.3
- https://lists.apache.org/thread/vfn9hp9qt06db5yo1gmj3l114o3o2csd
- http://www.openwall.com/lists/oss-security/2025/09/29/3
- https://pypi.org/project/pyfory
- https://github.com/advisories/GHSA-538v-3wq9-4h3r
- https://pypi.org/project/pyfury
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-502- Platform
- Python (PyPI)
- Package
pyfory, pyfury- Disclosed
- 01.10.2025
- Updated
- 11.10.2026 13:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-490 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-538v-3wq9-4h3r - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-491 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: pyfury
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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