Dockerfile Security & Quality Audit
Hadolint-grade Dockerfile audit as an MCP server. 18+ checks across 5 categories, every finding ships with severity, line number, remediation text, and a copy-paste Dockerfile snippet.
Built by Unbearable Labs. Pay-per-event pricing — only billed when a tool is actually called.
Available on
- Apify Actor Store — primary, metered usage (PPE)
- MCPize — pending submission
- MCP.so — pending submission
- PulseMCP — pending submission
- Smithery — pending submission
- Glama — pending submission
Newsletter: Unbearable TechTips Weekly · All Actors: github.com/UnbearableDev
What it does
Point any MCP-capable client (Claude Desktop, Cursor, n8n, Make, Zapier, custom agents) at this server, hand it a Dockerfile, get back a structured report:
- Severity — high / medium / low / info
- Line number — exact location in the file
- Description — what's wrong and why it matters
- Remediation — what to do about it
- Fix snippet — Dockerfile syntax you can paste directly
Tools
| Tool | Purpose |
|---|---|
audit_dockerfile(dockerfile_content? | dockerfile_url?, min_severity='low') | Run all checks |
check_base_image(...) | FROM/tag/digest/registry checks only |
check_instructions(...) | CMD form, ADD vs COPY, MAINTAINER, etc. |
check_security(...) | USER, sudo, chmod 777, curl|bash, hardcoded secrets, HEALTHCHECK |
check_efficiency(...) | apt cache hygiene, pip caching |
check_secrets(...) | ARG with secret-pattern names |
list_checks(category?) | Browse the full check catalog |
Provide exactly one of dockerfile_content (paste the file) or dockerfile_url (HTTPS URL — e.g. GitHub raw).
Check catalog (v1: 18 checks across 5 categories)
| ID | Category | Severity | Title |
|---|---|---|---|
| DFA-001 | base_image | medium | Image uses :latest tag or no tag |
| DFA-002 | base_image | info | No SHA256 digest pin on FROM |
| DFA-003 | base_image | medium | Untrusted registry |
| DFA-010 | instructions | low | CMD in shell form |
| DFA-011 | instructions | low | ENTRYPOINT in shell form |
| DFA-012 | instructions | info | MAINTAINER instruction is deprecated |
| DFA-013 | instructions | medium | ADD used where COPY would suffice |
| DFA-020 | security | medium | No USER directive (runs as root) |
| DFA-021 | security | high | USER root set explicitly |
| DFA-022 | security | high | sudo invoked in RUN |
| DFA-023 | security | high | chmod 777 in RUN |
| DFA-024 | security | medium | curl|bash pattern in RUN |
| DFA-025 | security | high | Hardcoded secret in ENV |
| DFA-027 | security | low | No HEALTHCHECK |
| DFA-030 | efficiency | low | apt-get update without install |
| DFA-031 | efficiency | low | apt-get install without --no-install-recommends |
| DFA-032 | efficiency | low | pip install without --no-cache-dir |
| DFA-040 | secrets | medium | ARG with secret-pattern name |
Use list_checks to get the canonical, up-to-date catalog.
Pricing
| Event | USD |
|---|---|
| Any audit / check_* tool call | $0.02 |
list_checks discovery | $0.005 |
Example response (truncated)
{
"summary": {
"total_findings": 6,
"by_severity": {"high": 2, "medium": 2, "low": 2, "info": 0}
},
"findings": [
{
"id": "DFA-021",
"category": "security",
"severity": "high",
"instruction": "USER",
"line_number": 3,
"title": "USER root set explicitly",
"description": "...",
"remediation": "Switch to a non-root UID after any root-required RUN steps.",
"fix_dockerfile_snippet": "USER 10001:10001",
"references": ["CIS-Docker-4.1"]
}
]
}
Connecting from Claude Desktop
{
"mcpServers": {
"dockerfile-audit": {
"transport": "streamable-http",
"url": "https://YOUR-ACTOR-URL.apify.actor/mcp"
}
}
}
Limits
- Dockerfile size: 200 KB cap per audit
- URL fetch: 5s timeout, max 3 redirects, HTTPS only
- Session timeout: 5 minutes of inactivity
What's NOT covered (yet)
- Live image vulnerability scanning (use Trivy / Grype for that)
- Multi-stage build optimization analysis (DFA-004 / DFA-005 — roadmapped)
- Compose-file audit (separate MCP:
docker-compose-audit)
Sibling MCPs from Unbearable Labs
docker-compose-audit— same pattern fordocker-compose.ymlhu-postcode-validator— Hungarian postcode lookup
Source / contact
Issues and ideas: unbearabledev@gmail.com or the GitHub org UnbearableDev.