Summary
muxi-runtime v0.20260319.0 was classified as CRITICAL RISK with a risk score of 4202. Sigil detected 448 findings across 346 files, covering phases including network exfiltration, install hooks, provenance, code patterns, obfuscation. Review the findings below before installing this package.
Package description: Production-ready runtime for building and orchestrating intelligent multi-agent AI systems
v0.20260319.0
20 March 2026, 00:57 UTC
by Sigil Bot
Risk Score
4202
Findings
448
Files Scanned
346
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
muxi_runtime-0.20260319.0/PKG-INFO:209
# Install MUXI CLI
curl -fsSL https://muxi.ai/install | 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-makefile-curl
HIGHMakefile/script pipes remote content to shell
muxi_runtime-0.20260319.0/README.md:79
# Install MUXI CLI
curl -fsSL https://muxi.ai/install | 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-setup-py-cmdclass
CRITICALsetup.py overrides cmdclass — may execute code during install
muxi_runtime-0.20260319.0/setup.py:151
# CLI will be installed as Go binary in post-install
cmdclass={
"install": PostInstallCommand,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.
install-pip-setup-exec
CRITICALsetup.py executes code at install time
muxi_runtime-0.20260319.0/src/muxi/runtime/formation/overlord/overlord.py:317
The overlord constructor now focuses purely on intelligence concerns.
All operational setup (configuration loading, service initialization,
resource management) is handled by Formation before creating the overlord.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.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
muxi_runtime-0.20260319.0/src/muxi_runtime.egg-info/PKG-INFO:209
# Install MUXI CLI
curl -fsSL https://muxi.ai/install | 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.
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