# CVE-2025-71320: picklescan - Remote Code Execution via Incomplete Disallowed Inputs

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

picklescan before 0.0.33 contains an incomplete deny-list that fails to block pydoc.locate and operator.methodcaller functions, allowing attackers to bypass security checks. Remote attackers can craft malicious pickle files using these unblocked functions to achieve arbitrary code execution when the pickle is deserialized.

## Remediation

- fix: picklescan (PyPI): OSV reports a fixed version 0.0.33. Check the advisory for supported release branches. (source: OSV GHSA-84r2-jw7c-4r5q) — https://github.com/advisories/GHSA-84r2-jw7c-4r5q

## 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-84r2-jw7c-4r5q

## 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: 0.82% as of 2026-11-08; percentile 57.58%

- 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-84r2-jw7c-4r5q (ADP: CISA-ADP)

## References

- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-84r2-jw7c-4r5q (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/picklescan-remote-code-execution-via-incomplete-disallowed-inputs (CNA: VulnCheck; third-party-advisory)

- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-84r2-jw7c-4r5q (ADP: CISA-ADP; exploit)

- https://github.com/advisories/GHSA-84r2-jw7c-4r5q (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-84r2-jw7c-4r5q (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2025-71320; retrieved 2026-11-08; source updated 2026-11-08

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-84r2-jw7c-4r5q; retrieved 2026-11-08; source updated 2026-07-07

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-71320; retrieved 2026-11-08; source updated Not reported

Revision: f436050988f3e0775473e31d607a44b53f73284801ac71a8048d6bd70db86a85

Canonical: https://y2.dev/cve/CVE-2025-71320

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