# CVE-2025-61622: PYSEC-2026-491 - Apache Pyfory python is vulnerable to deserialization of untrusted data

Source: https://junglewise.ai/threats/cve-2025-61622-apache-pyfory-python-is-vulnerable-to-deserialization-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-29  
License: CC BY 4.0 with a link back

CVE-2025-61622 · Severity: low · CVSS 3.1 · Published 2026-06-29

Apache Pyfory python is vulnerable to deserialization of untrusted data

Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2025-61622 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-61622 being exploited in the wild.

**How severe is CVE-2025-61622?** Low severity, with a CVSS score of 3.1, published 29 June 2026.

**Which products and versions are affected?** pyfory (PyPI) ECOSYSTEM:introduced=0.12.0,fixed=0.12.3; pyfury (PyPI) ECOSYSTEM:introduced=0.1.0,last_affected=0.10.3.

**Is there a fix for CVE-2025-61622?** Yes. pyfory (PyPI): upgrade to 0.12.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-61622?** Check whether you run pyfory (PyPI) or pyfury (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- pyfory (PyPI): upgrade to 0.12.3 or later

  ```sh
  pip install "pyfory>=0.12.3"
  ```


## Affected products

- pyfory (PyPI) ECOSYSTEM:introduced=0.12.0,fixed=0.12.3
- pyfury (PyPI) ECOSYSTEM:introduced=0.1.0,last_affected=0.10.3

## Identifiers

- CVE-2025-61622
- GHSA-538v-3wq9-4h3r
- PYSEC-2026-490
- PYSEC-2026-491

## Related threats

- [Apache Fory PyFory deserialization bypass in ReduceSerializer](https://junglewise.ai/threats/cve-2026-48207-apache-fory-pyfory-deserialization-bypass-in-reduceserializer)