Summary
luutuankiet/fs-mcp v2026-03-22 was classified as CRITICAL RISK with a risk score of 2750. Sigil detected 251 findings across 320 files, covering phases including network exfiltration, install hooks, provenance, code patterns, obfuscation. Review the findings below before installing this package.
Package description: A python based filesystem mcp server with streamable-http support and built in streamlit inspector UI
v2026-03-22
23 March 2026, 00:03 UTC
by Sigil Bot
Risk Score
2750
Findings
251
Files Scanned
320
Provenance
Repository
https://github.com/luutuankiet/fs-mcpScanned From
https://github.com/luutuankiet/fs-mcp.gitFindings 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-pip-setup-exec
CRITICALsetup.py executes code at install time
repo/.claude/get-shit-done/templates/phase-prompt.md:470
## User Setup (External Services)
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/.opencode/get-shit-done/templates/phase-prompt.md:470
## User Setup (External Services)
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
repo/src/fs_mcp/utils.py:65
'rtk': {
'Darwin': 'brew install rtk-ai/tap/rtk # or: curl -fsSL https://raw.githubusercontent.com/rtk-ai/rtk/refs/heads/master/install.sh | sh',
'Windows': 'cargo install --git https://github.com/rtk-ai/rtk # or download from https://github.com/rtk-ai/rtk/releases',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/src/fs_mcp/utils.py:68
'Linux': {
'default': 'curl -fsSL https://raw.githubusercontent.com/rtk-ai/rtk/refs/heads/master/install.sh | sh # installs to ~/.local/bin # https://github.com/rtk-ai/rtk#installation',
},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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