# CVE-2025-71362: picklescan detection bypass in numpy.f2py.crackfortran

Source: https://junglewise.ai/threats/cve-2025-71362-picklescan-detection-bypass-in-numpy-f2py-crackfortran  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-04. Updated: 2026-07-04  
License: CC BY 4.0 with a link back

CVE-2025-71362 · Severity: high · CVSS 8.1 · Published 2026-07-04

picklescan is a security tool used to scan Python "pickle" files for malicious code before they are opened. A flaw in the tool allows specially crafted malicious files to bypass detection by using specific functions from the NumPy library. If a user relies on an affected version of picklescan to verify a file from an untrusted source, an attacker could execute arbitrary commands on the user's system when the file is eventually loaded.

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

## Quick answers

**Is CVE-2025-71362 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-71362 being exploited in the wild.

**How severe is CVE-2025-71362?** High severity, with a CVSS score of 8.1, published 4 July 2026.

**Which products and versions are affected?** picklescan (PyPI) ECOSYSTEM:introduced=0,fixed=0.0.33.

**Is there a fix for CVE-2025-71362?** Yes. picklescan (PyPI): upgrade to 0.0.33 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-71362 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2025-71362?** Check whether you run picklescan (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

- picklescan (PyPI): upgrade to 0.0.33 or later

  ```sh
  pip install "picklescan>=0.0.33"
  ```


## Technical details

picklescan versions prior to 0.0.33 contain a detection bypass vulnerability (CWE-502) related to unsafe deserialization. The tool fails to identify malicious payloads that leverage functions within the `numpy.f2py.crackfortran` module, such as `getlincoef` and `_eval_length`, which internally call `eval()` on input strings. An attacker can craft a malicious pickle file that uses these NumPy functions as a gadget to execute arbitrary Python code. While the attack requires a user to attempt to load the malicious file, the failure of picklescan to flag the threat provides a false sense of security. The issue is resolved in version 0.0.33.

## Affected products

- mmaitre314 picklescan < 0.0.33

## Identifiers

- CVE-2025-71362
- GHSA-r8g5-cgf2-4m4m

## Timeline

- 2025-12-26: advisory: Initial GitHub security advisory published
- 2026-07-04: disclosed: NVD publication date

## References

- [https://github.com/mmaitre314/picklescan/security/advisories/GHSA-r8g5-cgf2-4m4m](https://github.com/mmaitre314/picklescan/security/advisories/GHSA-r8g5-cgf2-4m4m)
- [https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-unsafe-deserialization-in-numpy-f2py-crackfortran](https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-unsafe-deserialization-in-numpy-f2py-crackfortran)

## Related threats

- [picklescan detection bypass via _operator.methodcaller](https://junglewise.ai/threats/cve-2025-71375-picklescan-detection-bypass-via-operator-methodcaller)
- [picklescan security bypass via operator.methodcaller](https://junglewise.ai/threats/cve-2025-71373-picklescan-security-bypass-via-operator-methodcaller)
- [Picklescan detection bypass via numpy getlincoef gadget](https://junglewise.ai/threats/cve-2025-71372-picklescan-detection-bypass-via-numpy-getlincoef-gadget)
- [picklescan safety check bypass via PyTorch decoder basichandlers](https://junglewise.ai/threats/cve-2025-71369-picklescan-safety-check-bypass-via-pytorch-decoder-basichandlers)
- [picklescan security bypass via _operator.attrgetter function call](https://junglewise.ai/threats/cve-2025-71367-picklescan-security-bypass-via-operator-attrgetter-function-call)