Base Image EOL Lint - Dockerfile and CI end-of-life check

Runs the same checker as our npm package on a Node.js runtime that pip installs for you (nodejs-wheel-binaries) - no system Node.js needed. Your files are checked locally.

Marks every base image in your Dockerfiles, compose files and CI workflows whose security patches have already stopped - or stop before 13 November 2026 - and prints the tag that replaces it.

Install

base-image-eol-lint file

Node 18+. The same 21 rules as the VS Code extension, from a terminal or CI.

Free

• Checks the file you have open against all 21 rules and shows every out-of-support image with the tag that replaces it and how long it has been unpatched - no key, no limit, no watermark.
• --rules lists every rule

With a licence ($29 once)

• Scans every Dockerfile, compose file and workflow in the repository at once, writes a dated CSV/JSON/HTML report, and prints machine-readable output so CI fails the build before an unpatched base image ships.

base-image-eol-lint --dir ./templates --report html --out report.html

Snyk's Team tier is $25 per contributing developer per month.

Use from an AI agent (MCP)

Claude Code · Cursor · Windsurf · any MCP client - add to your MCP config:

{ "mcpServers": { "base-image-eol-lint": { "command": "base-image-eol-lint", "args": ["--mcp"] } } }

Tools: check_text and check_file (free) · check_dir (licence). The agent gets every finding with the line number.

Use in CI

- name: Base Image EOL Lint - Dockerfile and CI end-of-life check
  run: pip install rulestamp-base-image-eol-lint && base-image-eol-lint --dir . --ci

The folder sweep, reports and CI mode need one licence — one payment, no subscription. Set READYSTACK_LICENSE=<key> or run --license <key> once.

Get a licence

Install (PyPI)

pip install rulestamp-base-image-eol-lint
base-image-eol-lint --help