MCP, MCP server
squirrelscan
The website QA tool for your coding agent
Compatibility: Not stated.
Grade D
Two or more Medium findings, or a High finding. Only try it in a sandbox.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
Rescanned at commit 02c57de5b715.
INSTALL_REMOTE_SCRIPT OBFUSCATION_ENCODED_BLOB
Why this grade
- INSTALL_REMOTE_SCRIPT Medium
Fetches a script from the network and runs it (a pipe to a shell, or an install hook with a URL).
install.sh, line 19
exec bash -c 'curl -fsSL --proto "=https" --proto-redir "=https" --tlsv1.2 --max-redirs 3 https://install.squirrelscan.com/install.sh | bash' - OBFUSCATION_ENCODED_BLOB Medium
Contains a long base64 shaped string in a file that should be readable.
CHANGELOG.md, line 1
# Changelog
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Pass
No shell or command execution found, and no extra permission was declared.
Install and update
Serious
install fetches a script from the network. The docs document an installer that pipes a download into a shell.
INSTALL_REMOTE_SCRIPT INSTALL_DOCUMENTED_INSTALLER
install.sh, line 19
exec bash -c 'curl -fsSL --proto "=https" --proto-redir "=https" --tlsv1.2 --max-redirs 3 https://install.squirrelscan.com/install.sh | bash'
install.sh, line 29
# Usage: curl -fsSL https://install.squirrelscan.com/install.sh | bash
install.sh, line 30
# Or: curl -fsSL https://raw.githubusercontent.com/squirrelscan/squirrelscan/main/install.sh | bash
Show more
.github/workflows/test-install.yml, line 94
curl -fsSL '$INSTALL_URL' | bash
.github/workflows/test-install.yml, line 236
curl -fsSL '$INSTALL_URL' | bash
.github/workflows/test-install.yml, line 375
curl -fsSL '$INSTALL_URL' | bash
.github/workflows/test-install.yml, line 547
curl -fsSL '$INSTALL_URL' | bash
npm/bin/squirrel.js, line 53
console.error(" curl -fsSL https://install.squirrelscan.com | bash");
scripts/install-contract.test.ts, line 780
`exec bash -c 'curl -fsSL --proto "=https" --proto-redir "=https" --tlsv1.2 --max-redirs 3 https://install.squirrelscan.com/install.sh | bash'`,
README.md, line 87
curl -fsSL https://install.squirrelscan.com | bash
docs/agent-setup/prompt.mdx, line 22
curl -fsSL --connect-timeout 10 --max-time 120 https://install.squirrelscan.com | bash
docs/developers/agents/claude-code.mdx, line 17
curl -fsSL https://install.squirrelscan.com | bash
docs/developers/agents/codex.mdx, line 17
curl -fsSL https://install.squirrelscan.com | bash
docs/developers/agents/copilot.mdx, line 19
curl -fsSL https://install.squirrelscan.com | bash
docs/developers/agents/cursor.mdx, line 17
curl -fsSL https://install.squirrelscan.com | bash
docs/developers/agents/gemini-cli.mdx, line 17
curl -fsSL https://install.squirrelscan.com | bash
docs/developers/agents/opencode.mdx, line 17
curl -fsSL https://install.squirrelscan.com | bash
docs/developers/agents/windsurf.mdx, line 19
curl -fsSL https://install.squirrelscan.com | bash
docs/guides/ci.mdx, line 58
curl -fsSL --connect-timeout 10 --max-time 120 https://install.squirrelscan.com | bash
docs/guides/ci.mdx, line 72
- curl -fsSL --connect-timeout 10 --max-time 120 https://install.squirrelscan.com | bash
docs/guides/ci.mdx, line 85
curl -fsSL --connect-timeout 10 --max-time 120 https://install.squirrelscan.com | bash
docs/guides/local-audits-cli.mdx, line 18
curl -fsSL --connect-timeout 10 --max-time 120 https://install.squirrelscan.com | bash
docs/quickstart.mdx, line 14
curl -fsSL --connect-timeout 10 --max-time 120 https://install.squirrelscan.com | bash
Network
Concern
can reach a host that is not written as a fixed address. can reach api.example.com. The description does not name that host.
NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST
install.sh, line 43
# Transport hardening for every curl this script runs. curl's own defaults will
install.sh, line 51
# --tlsv1.2 is the youngest of the four and landed in curl 7.34 (2013), below
install.sh, line 183
command -v curl >/dev/null 2>&1 || return 0
Show more
install.sh, line 220
# installer. `( cmd & )` backgrounds curl and lets the subshell exit
install.sh, line 221
# immediately (non-blocking); curl is reparented to init so it still gets to
install.sh, line 224
( curl "${CURL_TLS_ARGS[@]}" -fsS -m 3 --connect-timeout 2 -X POST \
install.sh, line 245
# stand-in has to serve TLS that the running curl already trusts.
install.sh, line 797
command -v curl >/dev/null 2>&1 || error "curl is required but not installed"
Secrets
Concern
reads a credential or environment file.
SECRETS_ENV_READ SECRETS_PATH_DOTENV
apps/cli/scripts/benchmark-lighthouse.ts, line 174
if (!process.env.GOOGLE_PSI_API_KEY) {
apps/cli/src/benchmark/pagespeed.ts, line 40
const apiKey = options.apiKey ?? process.env.GOOGLE_PSI_API_KEY;
scripts/install-contract.test.ts, line 348
env: { ...process.env, NO_TELEMETRY: "1", ...env } as Record<string, string>,
Show more
.gitignore, line 6
.env
docs/developers/mcp-clients.mdx, line 120
`${env:NAME}` interpolates a shell/system environment variable at connect time. Cursor does not read a `.env` file for remote servers, so export `SQUIRRELSCAN_API_KEY` in your shel
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Concern
contains an encoded blob in a file that should be readable.
OBFUSCATION_ENCODED_BLOB
CHANGELOG.md, line 1
# Changelog
bun.lock, line 1
{
apps/cli/tests/crawler/tls-fallback.test.ts, line 1
import type { DocumentFetcher, FetchResponse } from "@squirrelscan/fetchers";
Show more
packages/utils/src/agent-skills/bundle.generated.ts, line 37
"content": "iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAAAXNSR0IArs4c6QAAAHhlWElmTU0AKgAAAAgABAEaAAUAAAABAAAAPgEbAAUAAAABAAAARgEoAAMAAAABAAIAAIdpAAQAAAABAAAATgAAAAAAAAAZAAAAAQAA
packages/utils/src/agent-skills/bundle.generated.ts, line 90
"content": "iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAAAXNSR0IArs4c6QAAAHhlWElmTU0AKgAAAAgABAEaAAUAAAABAAAAPgEbAAUAAAABAAAARgEoAAMAAAABAAIAAIdpAAQAAAABAAAATgAAAAAAAAAZAAAAAQAA
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit 02c57de5b715. install fetches a script from the network. can reach a host that is not written as a fixed address. can reach api.example.com. The description does not name that host. reads a credential or environment file. contains an encoded blob in a file that should be readable.
Date and source
Date checked:
github.com
Commit graded: 02c57de5b71587d0e25c1e4255ae0db2d26d3f2b
This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.