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

Status: published. Published: 2026-06-17. Updated: 2026-11-08.

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.

## Remediation

- fix: picklescan (PyPI): OSV reports a fixed version 0.0.33. Check the advisory for supported release branches. (source: OSV GHSA-4675-36f9-wf6r) — https://github.com/advisories/GHSA-4675-36f9-wf6r

## Affected products and versions

- picklescan / picklescan (picklescan): ≥ 0; < 0.0.33 (affected, semver); 0.0.33 (unaffected, semver). Source: CNA: VulnCheck
-  / picklescan (picklescan): 0.0.1 (affected, PyPI); 0.0.10 (affected, PyPI); 0.0.11 (affected, PyPI); 0.0.12 (affected, PyPI); 0.0.13 (affected, PyPI); 0.0.14 (affected, PyPI); 0.0.15 (affected, PyPI); 0.0.16 (affected, PyPI); 0.0.17 (affected, PyPI); 0.0.18 (affected, PyPI); 0.0.19 (affected, PyPI); 0.0.2 (affected, PyPI); 0.0.20 (affected, PyPI); 0.0.21 (affected, PyPI); 0.0.22 (affected, PyPI); 0.0.23 (affected, PyPI); 0.0.24 (affected, PyPI); 0.0.25 (affected, PyPI); 0.0.26 (affected, PyPI); 0.0.27 (affected, PyPI); 0.0.28 (affected, PyPI); 0.0.29 (affected, PyPI); 0.0.3 (affected, PyPI); 0.0.30 (affected, PyPI); 0.0.31 (affected, PyPI); 0.0.32 (affected, PyPI); 0.0.4 (affected, PyPI); 0.0.5 (affected, PyPI); 0.0.6 (affected, PyPI); 0.0.7 (affected, PyPI); 0.0.8 (affected, PyPI); 0.0.9 (affected, PyPI); Ecosystem version events: introduced 0; fixed 0.0.33. Source: OSV GHSA-4675-36f9-wf6r

## Severity and prioritization

- CVSS 4.0: 9.3 (critical); 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; source: CNA: VulnCheck

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.99% as of 2026-11-08; percentile 62.78%

- SSVC: exploitation poc; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-184

## Exploit evidence

- exploit: https://github.com/mmaitre314/picklescan/security/advisories/GHSA-4675-36f9-wf6r (ADP: CISA-ADP)

## References

- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-4675-36f9-wf6r (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/picklescan-remote-code-execution-via-unblocked-ctypes-module (CNA: VulnCheck; third-party-advisory)

- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-4675-36f9-wf6r (ADP: CISA-ADP; exploit)

- https://github.com/advisories/GHSA-4675-36f9-wf6r (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-4675-36f9-wf6r (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2025-71323; retrieved 2026-11-08; source updated 2026-11-08

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-4675-36f9-wf6r; retrieved 2026-11-08; source updated 2026-07-07

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-71323; retrieved 2026-11-08; source updated Not reported

Revision: c45f75174bc1f2cf1530c03683faf7ec5060f654d954d832ec845b2d5e7556e1

Canonical: https://y2.dev/cve/CVE-2025-71323

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