Summary
yvgude/lean-ctx v2026-03-29 was classified as CRITICAL RISK with a risk score of 343. Sigil detected 18 findings across 151 files, covering phases including provenance, install hooks, code patterns. Review the findings below before installing this package.
Package description: Hybrid Context Optimizer — Shell Hook + MCP Server. Reduces LLM token consumption by 89-99%. Single Rust binary, zero dependencies.
v2026-03-29
29 March 2026, 12:30 UTC
by Sigil Bot
Risk Score
343
Findings
18
Files Scanned
151
Provenance
Repository
https://github.com/yvgude/lean-ctxScanned From
https://github.com/yvgude/lean-ctx.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-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/CHANGELOG.md:185
- **Persistent Project Graph** — New `ctx_graph` with 5 actions (`build`, `related`, `symbol`, `impact`, `status`). Incrementally scans project files, persists index to `~/.lean-ctx/graphs/`, and enables symbol-level reads at up to 93% token savings over full file reads
- **`install.sh`** — Universal installer with `--download` mode (no Rust required), SHA256 checksum verification, and one-liner support: `curl -fsSL .../install.sh | bash -s -- --download`
- **`lean-ctx-bin` npm package** — Pre-bWhy 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:54
# 1. Install (pick one)
curl -fsSL https://leanctx.com/install.sh | sh # universal, no Rust
brew tap yvgude/lean-ctx && brew install lean-ctx # macOS / LinuxWhy 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:132
# 1. Install (pick one)
curl -fsSL https://leanctx.com/install.sh | sh # universal, no Rust needed
brew tap yvgude/lean-ctx && brew install lean-ctx # macOS / LinuxWhy 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/bin/lctx:32
echo "Install: cargo install lean-ctx"
echo " or: curl -fsSL https://raw.githubusercontent.com/yvgude/lean-ctx/main/install.sh | bash -s -- --download"
exit 1Why 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:10
# One-liner (no Rust required):
# curl -fsSL https://leanctx.com/install.sh | sh
set -euo pipefailWhy 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/packages/lean-ctx-bin/README.md:33
# Universal installer (no Rust needed)
curl -fsSL https://leanctx.com/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-npm-postinstall
CRITICALnpm lifecycle script — runs automatically on install
repo/packages/lean-ctx-bin/package.json:17
"scripts": {
"postinstall": "node postinstall.js"
},Why was this flagged?
npm lifecycle scripts like postinstall run automatically during package installation with no user interaction required. This is the #1 attack vector for malicious npm packages — attackers embed data theft or backdoor installation in these hooks. Rated CRITICAL because code executes before the developer can review it.
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