I
io.github.polygraphso/litmus
pnpm
Grade MCP servers A–F with the open behavioral litmus: reproducible, content-addressed evidence.
No known CVEs
No license
Actively maintained
Last commit 1d ago
Works with most clients
Transport: stdio, http
0 tools
Grade F
MCPpedia last refreshed this data
Step 1
Install in your client
Config is the same across clients — only the file and path differ.
CD
Supported in Claude Desktopstdio, http · Node 18+
Paste into ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"io-github-polygraphso-litmus": {
"args": [
"-y",
"pnpm"
],
"command": "npx"
}
}
}Are you the author?
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[](https://mcppedia.org/s/io-github-polygraphso-litmus)
Read me
What io.github.polygraphso/litmus does
This is the source for @polygraphso/litmus, the open behavioral litmus harness for MCP servers from polygraph.so.
Test This Server
Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.
npx -y 'pnpm' 2>&1 | head -1 && echo "✓ Server started successfully"
After testing, let us know if it worked:
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Scored, not listed
Why this score
Five weighted categories — click any category to see the underlying evidence.
Score breakdown
60/100across 5 weighted dimensions
0255075100
19
17
14
10
−40
Security
Maintenance
Efficiency
Documentation
Compatibility
Categoriesclick a row to see evidence
Security
OSV.dev31 fixed
CVE-2026-59195high · fixedCVSS 8.2
pnpm: Path traversal in configDependencies env lockfile allows symlink creation outside node_modules/.pnpm-config
## Summary `pnpm` accepts package names from the env lockfile `configDependencies` section and uses those names directly when creating config dependency symlinks under `node_modules/.pnpm-config`. A malicious repository can commit a crafted `pnpm-lock.yaml` whose env-lockfile document contains a traversal-shaped config dependency name such as `../../PWNED_CFGDEP`. During `pnpm install`, pnpm installs the config dependency and creates a symlink at a path derived from that name. In local testin
GHSA-qrv3-253h-g69chigh · fixedCVSS 8.2
pnpm: Path traversal in configDependencies env lockfile allows symlink creation outside node_modules/.pnpm-config
## Summary `pnpm` accepts package names from the env lockfile `configDependencies` section and uses those names directly when creating config dependency symlinks under `node_modules/.pnpm-config`. A malicious repository can commit a crafted `pnpm-lock.yaml` whose env-lockfile document contains a traversal-shaped config dependency name such as `../../PWNED_CFGDEP`. During `pnpm install`, pnpm installs the config dependency and creates a symlink at a path derived from that name. In local testin
GHSA-72r4-9c5j-mj57high · fixedCVSS 7.1
pnpm: `patch-remove` could delete project-selected files outside the patches directory
## Summary The `patch-remove` deletion-scope issue tracked as GHSA-72r4-9c5j-mj57 / CAND-PNPM-030 has been addressed in pnpm. A crafted patch entry could resolve outside the configured patches directory and cause `pnpm patch-remove` to delete an arbitrary reachable file. This patch validates the configured directory and every resolved target before unlinking anything, then deletes the final directory entry without following it. ## Security boundary - Traversal and absolute paths that resolve
CVE-2026-59194high · fixedCVSS 7.1
pnpm: `patch-remove` could delete project-selected files outside the patches directory
## Summary The `patch-remove` deletion-scope issue tracked as GHSA-72r4-9c5j-mj57 / CAND-PNPM-030 has been addressed in pnpm. A crafted patch entry could resolve outside the configured patches directory and cause `pnpm patch-remove` to delete an arbitrary reachable file. This patch validates the configured directory and every resolved target before unlinking anything, then deletes the final directory entry without following it. ## Security boundary - Traversal and absolute paths that resolve
GHSA-fr4h-3cph-29xvhigh · fixedCVSS 7.1
pnpm: Hoisted install imports lockfile alias outside node_modules
## Summary The hoisted dependency alias issue tracked as GHSA-fr4h-3cph-29xv / CAND-PNPM-059 has been addressed in both pnpm and pacquet. A crafted lockfile alias could be joined directly under a hoisted `node_modules` directory. Traversal aliases could escape that directory, while reserved aliases such as `.bin` or `.pnpm` could overwrite pnpm-owned layout. This patch validates package-name semantics and path containment before graph insertion or filesystem work. ## Security boundary - The
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Frequently Asked Questions
- Is io.github.polygraphso/litmus safe to use?
- io.github.polygraphso/litmus has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
- How do I install io.github.polygraphso/litmus?
- io.github.polygraphso/litmus supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
- What AI clients work with io.github.polygraphso/litmus?
- io.github.polygraphso/litmus is compatible with claude-desktop, cursor, claude-code. It uses stdio and http transport.
- Is io.github.polygraphso/litmus actively maintained?
- io.github.polygraphso/litmus is actively maintained — last commit was 1 day ago. It has 7 GitHub stars.
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