# CVE-2025-71375: picklescan detection bypass via _operator.methodcaller

Source: https://junglewise.ai/threats/cve-2025-71375-picklescan-detection-bypass-via-operator-methodcaller  
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-2025-71375 · Severity: high · CVSS 8.1 · Published 2026-07-04

picklescan is a security tool used to scan Python pickle files and machine learning models for malicious code. A vulnerability was discovered where the tool fails to identify certain dangerous commands, allowing specially crafted malicious files to bypass security checks. If a user relies on this tool to verify a file and then opens it, an attacker could execute arbitrary code on the user's system, potentially leading to full system compromise or data theft.

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

## Quick answers

**Is CVE-2025-71375 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-71375 being exploited in the wild.

**How severe is CVE-2025-71375?** 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=0.0.34.

**Is there a fix for CVE-2025-71375?** Yes. picklescan (PyPI): upgrade to 0.0.34 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-71375 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2025-71375?** 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 0.0.34 or later

  ```sh
  pip install "picklescan>=0.0.34"
  ```


## Technical details

A deserialization vulnerability (CWE-502) exists in picklescan versions prior to 0.0.34 due to an incomplete blocklist of dangerous Python built-ins. Specifically, the scanner fails to detect the '_operator.methodcaller' function when it is used within a pickle payload's __reduce__ method. An attacker can craft a malicious pickle file that evades detection by picklescan but executes arbitrary system commands when subsequently loaded by 'pickle.load()'. Exploitation requires the victim to scan the malicious file and then proceed to deserialize it. The issue is resolved in version 0.0.34.

## Affected products

- picklescan picklescan < 0.0.34

## Identifiers

- CVE-2025-71375
- GHSA-955r-x9j8-7rhh

## Timeline

- 2025-12-27: advisory: GitHub Security Advisory published
- 2026-07-04: disclosed: NVD publication date

## References

- [https://github.com/mmaitre314/picklescan/security/advisories/GHSA-955r-x9j8-7rhh](https://github.com/mmaitre314/picklescan/security/advisories/GHSA-955r-x9j8-7rhh)
- [https://www.vulncheck.com/advisories/picklescan-undetected-remote-code-execution-via-operator-methodcaller](https://www.vulncheck.com/advisories/picklescan-undetected-remote-code-execution-via-operator-methodcaller)

## Related threats

- [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)
- [picklescan security bypass via torch.utils.bottleneck in pickle files](https://junglewise.ai/threats/cve-2025-71366-picklescan-security-bypass-via-torch-utils-bottleneck-in-pickle)