Docker Security Lint Lite

Docker Security Lint (Lite)

Lint Dockerfiles the user supplies with the bundled scripts/lint.js, then turn the JSON report into a fix list.

Scope and rules

• Only lint files the user supplied or is authorized to inspect.
• Static line-based checks only — nothing is executed or pulled.
• Secret values are reported masked, never raw. Recommend rotation for anything live.
• Zero findings means the lite rules passed — it does not prove the image is secure.

Lite rules checked

• image-latest (warn) — FROM with :latest or no tag.
• root-user (warn) — no USER directive.
• baked-secret (fail) — ENV/ARG secret-looking name with a literal value.
• run-curl-sh (fail) — RUN piping curl/wget into sh/bash.
• add-remote (warn) — ADD with an http(s) URL.

1. Run

Requires Node 18+, zero dependencies.

node <skill-dir>/scripts/lint.js <Dockerfile> [more files...]

JSON on stdout; exit 1 on findings, 2 on usage/read error.

2. Deliver

List fail findings first with file:line, then warn. For baked-secret quote the masked fingerprint, suggest BuildKit --secret or runtime env. For image-latest suggest pinning a tag or digest.

Lite vs full

The full docker-security-lint adds docker-compose checks (privileged, host network, 0.0.0.0 ports, docker.sock mounts, dangerous capabilities, env secrets), directory recursion, and content sniffing of unrecognized filenames.

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