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Ofri Peretz
Ofri Peretz

Posted on • Edited on • Originally published at ofriperetz.dev

Runtime Security at Scale: The Node.js Static Analysis Standard

#eslint #node #security #cryptography

Node.js runtime security requires more than just dependencies updates. Here is the automated standard for hardening Node.js core—from crypto safety to process isolation—using 31 deep static analysis rules.

Quick Install 

npm install --save-dev eslint-plugin-node-security
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Flat Config 

// eslint.config.js
import nodeSecurity from 'eslint-plugin-node-security';

export default [nodeSecurity.configs.recommended];
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Run ESLint 

npx eslint .
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You'll see output like:

src/auth/hash.ts
  15:27 error  🔒 CWE-328 CVSS:7.5 | Weak hash algorithm: MD5
               [node-security/no-weak-hash-algorithm] Use crypto.createHash('sha256')

src/api/exec.ts
  10:5  error  🔒 CWE-78 | Detected child process execution
               [node-security/detect-child-process] Avoid exec(), use spawn() or execFile()
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Rule Overview

Category Rules Examples
Cryptography 12 Weak hashes, static IVs, ECB mode
System & Process 5 exec(), eval(), unsafe require
File System 6 Zip Slip, TOCTOU, path injection
Best Practices 8 PII in logs, insecure temp storage

Quick Wins

1. Cryptography 

// ❌ Weak hash
crypto.createHash('md5').update(data);

// ✅ Strong hash
crypto.createHash('sha256').update(data);
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2. System Security 

// ❌ Shell injection risk
require('child_process').exec(`ls ${userInput}`);

// ✅ Safer execution
require('child_process').execFile('ls', [userInput]);
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3. File System 

// ❌ Path traversal risk
fs.readFile(`/data/${userInput}`, cb);

// ✅ Validated path
if (isValid(userInput)) fs.readFile(path.join(ROOT, userInput), cb);
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Available Presets 

import nodeSecurity from 'eslint-plugin-node-security';

export default [
    // Recommended (Low false positives, High impact)
    nodeSecurity.configs.recommended,

    // All Rules (Stricter auditing)
    nodeSecurity.configs.all
];
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Quick Reference 

# Install
npm install --save-dev eslint-plugin-node-security

# Config (eslint.config.js)
import nodeSecurity from 'eslint-plugin-node-security';
export default [nodeSecurity.configs.recommended];

# Run
npx eslint .
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The Interlace ESLint Ecosystem
Interlace is a high-fidelity suite of static code analyzers designed to automate security, performance, and reliability for the modern Node.js stack. With over 330 rules across 18 specialized plugins, it provides 100% coverage for OWASP Top 10, LLM Security, and Database Hardening.

Explore the full Documentation

© 2026 Ofri Peretz. All rights reserved.

Build Securely.
I'm Ofri Peretz, a Security Engineering Leader and the architect of the Interlace Ecosystem. I build static analysis standards that automate security and performance for Node.js fleets at scale.

ofriperetz.dev | LinkedIn | GitHub

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