Summary
sandbox-mcp v was classified as CRITICAL RISK with a risk score of 1646. Sigil detected 118 findings across 159 files, covering phases including code patterns, provenance, install hooks, obfuscation, network exfiltration. Review the findings below before installing this package.
Package description: General-purpose Python execution sandbox with FastMCP tools, artifact capture, Manim rendering, and web demo workflows
v
13 March 2026, 03:33 UTC
by Sigil Bot
Risk Score
1646
Findings
118
Files Scanned
159
Provenance
Findings by Phase
Phase Ordering
Phases are ordered by criticality, with the most dangerous at the top. Click any phase header to expand or collapse its findings. Critical phases are expanded by default.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
sandbox_mcp-0.4.0/docs/installation.md:22
# macOS and Linux
curl -LsSf https://astral.sh/uv/install.sh | sh
Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
install-pip-setup-exec
CRITICALsetup.py executes code at install time
sandbox_mcp-0.4.0/tests/security/test_security_blockers.py:17
def setUp(self):
"""Set up test fixtures."""Why was this flagged?
This setup.py calls subprocess, os.system, exec, or eval during package installation. Legitimate packages rarely need to execute arbitrary commands at install time. This pattern is commonly used by malicious packages to download and run payloads, exfiltrate environment variables, or establish persistence. Rated CRITICAL because it runs with the installer's full permissions.
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