Summary
supermodeltools/mcpbr v2026-03-26 was classified as CRITICAL RISK with a risk score of 3935. Sigil detected 340 findings across 433 files, covering phases including provenance, install hooks, network exfiltration, obfuscation, code patterns. Review the findings below before installing this package.
Package description: Model Context Protocol Benchmark Runner
v2026-03-26
27 March 2026, 05:00 UTC
by Sigil Bot
Risk Score
3935
Findings
340
Files Scanned
433
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
repo/CHANGELOG.md:1019
- **One-Liner Install** (#302): Simplified installation with auto-init
- `curl -sSL https://raw.githubusercontent.com/greynewell/mcpbr/main/install.sh | bash`
- Automatically installs and runs quick testWhy 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
repo/Formula/mcpbr.rb:7
# NOTE: Update URL and sha256 when publishing a release.
# Run: curl -sL <url> | shasum -a 256
url "https://files.pythonhosted.org/packages/source/m/mcpbr/mcpbr-0.6.0.tar.gz"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
repo/README.md:5
# One-liner install (installs + runs quick test)
curl -sSL https://raw.githubusercontent.com/greynewell/mcpbr/main/install.sh | bash
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
repo/homebrew/README.md:27
```bash
curl -sL https://files.pythonhosted.org/packages/source/m/mcpbr/mcpbr-VERSION.tar.gz | shasum -a 256
```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
repo/install.sh:4
# mcpbr one-liner installer
# Usage: curl -sSL https://raw.githubusercontent.com/greynewell/mcpbr/main/install.sh | bash
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
repo/src/mcpbr/infrastructure/aws.py:683
async def setup(self) -> None:
"""Provision AWS EC2 instance and prepare for evaluation.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-pip-setup-exec
CRITICALsetup.py executes code at install time
repo/src/mcpbr/infrastructure/azure.py:525
async def setup(self) -> None:
"""Provision Azure VM and prepare for evaluation.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-pip-setup-exec
CRITICALsetup.py executes code at install time
repo/src/mcpbr/infrastructure/gcp.py:641
async def setup(self) -> None:
"""Provision GCE instance and prepare for evaluation.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-pip-setup-exec
CRITICALsetup.py executes code at install time
repo/src/mcpbr/infrastructure/k8s.py:168
Called from setup() when an error occurs mid-way through resource
creation. This prevents orphaned ConfigMaps or Secrets from leakingWhy 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-pip-setup-exec
CRITICALsetup.py executes code at install time
repo/tests/infrastructure/test_azure.py:632
await azure_provider.setup()
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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