Summary
mattijsmoens/sovereign-mcp v2026-03-21 was classified as CRITICAL RISK with a risk score of 357. Sigil detected 29 findings across 56 files, covering phases including provenance, code patterns, network exfiltration, credential access, install hooks, obfuscation. Review the findings below before installing this package.
Package description: Deterministic MCP Security Architecture. FrozenNamespace as Root of Trust for Model Context Protocol tool verification
v2026-03-21
23 March 2026, 11:55 UTC
by Sigil Bot
Risk Score
357
Findings
29
Files Scanned
56
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-setup-py-cmdclass
CRITICALsetup.py overrides cmdclass — may execute code during install
repo/setup.py:49
ext_modules=[frozen_memory_ext],
cmdclass={"build_ext": OptionalBuildExt},
)Why was this flagged?
This package overrides Python's setup.py cmdclass, which allows arbitrary code to execute during pip install. This is the primary attack vector for malicious PyPI packages — attackers use it to steal credentials, install backdoors, or download additional payloads before the developer ever runs the code. Rated CRITICAL because it executes automatically with no user interaction required.
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