Node.js v20 Reaches End of Life in April: 7 Critical Vulnerabilities Fixed

Hello HaWkers, if you're still running Node.js v20 in production, this is an important alert: version 20 reaches end of life (EOL) on April 30, 2026. Additionally, recent security updates fixed 7 vulnerabilities, including 3 high severity ones.

Let's understand what's happening and how to prepare for migration.

The End of Life Calendar

Node.js follows a predictable release calendar:

Version	Status	End of Support
Node.js 20	Maintenance	April 30, 2026
Node.js 22	Active LTS	April 2027
Node.js 24	Current LTS	April 2028
Node.js 25	Current	In development

🔥 Important: After April 30, 2026, Node.js v20 will NOT receive security patches. Any vulnerability discovered after that date will remain unpatched.

The 7 Fixed Vulnerabilities

In January 2026, the Node.js team released security updates for all supported versions. Here are the critical vulnerabilities:

High Severity (3)

1. CVE-2026-21634 - Memory Leak via Buffer

A flaw in Node.js buffer allocation logic can expose uninitialized memory when allocations are interrupted using the vm module with the timeout option.

Impact: Buffers allocated with Buffer.alloc and TypedArray instances may contain data from previous operations, allowing secrets like tokens or passwords to leak.

2. CVE-2026-21635 - Permissions Model Bypass

A flaw in Node.js Permissions model allows attackers to bypass --allow-fs-read and --allow-fs-write restrictions using crafted relative symlink paths.

Impact: Applications relying on the permissions model may have files accessed or modified without authorization.

3. CVE-2026-21636 - Bypass via Unix Domain Sockets

A permission model bypass affecting Unix Domain Socket connections specifically impacts version 25.x.

Medium Severity (4)

The other four medium severity vulnerabilities include:

• Input validation issues in HTTP modules
• Race conditions in filesystem operations
• Native module restriction bypasses
• Parsing issues with malformed URLs

Patched Versions

Versions with applied patches are:

• Node.js 20.20.0 (for those still on v20)
• Node.js 22.22.0 (recommended LTS)
• Node.js 24.13.0 (current LTS)
• Node.js 25.3.0 (Current)

Why Migrate Now?

1. Security

Running unsupported versions exposes your systems to unpatched vulnerabilities. This is especially critical for:

• Public APIs
• Applications processing sensitive data
• Systems under compliance (PCI-DSS, HIPAA, etc.)

2. Compatibility

New libraries and frameworks are starting to require Node.js 22+:

Minimum requirements in 2026:

• Next.js 15+: Node.js 20+
• Nuxt 4+: Node.js 22+ (recommended)
• NestJS 11+: Node.js 22+
• Prisma 6+: Node.js 20+

3. Performance

Node.js 22 and 24 bring significant performance improvements:

Metric	Node.js 20	Node.js 24
HTTP throughput	Baseline	+15%
Startup time	Baseline	-20%
Memory usage	Baseline	-10%

How to Migrate

Step 1: Check Compatibility

Before migrating, verify your dependencies support the new version:

# Check current version
node --version

# Check dependency engines
npm ls --depth=0

# Test with new version locally
nvm install 24
nvm use 24
npm test

Step 2: Update package.json

Update the engines field to reflect the new minimum version:

{
  "engines": {
    "node": ">=22.0.0"
  }
}

Step 3: Test Thoroughly

# Run complete test suite
npm test

# Check for deprecation warnings
node --trace-deprecation app.js

# Test in staging environment before production

Step 4: Update CI/CD

Update your pipelines to use the new version:

# GitHub Actions example
jobs:
  test:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        node-version: [22.x, 24.x]
    steps:
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}

Breaking Changes to Watch

From Node.js 20 to 22

Main changes:

• require() of ESM modules now emits warning
• Some experimental APIs were removed
• fs.watch behavior modified on some systems

From Node.js 22 to 24

Main changes:

• --experimental-modules flag removed
• Changes in crypto APIs
• V8 parser updates

Migration Checklist

Use this checklist to ensure a safe migration:

Preparation:

• Document current version and dependencies
• Check breaking changes in target version
• Test locally with new version
• Update package.json engines

Execution:

• Update development environment
• Run complete test suite
• Deploy to staging
• Monitor for errors
• Deploy to production

Post-migration:

• Check error logs
• Monitor performance metrics
• Update documentation

Final Recommendation

For new projects: Use Node.js 24 LTS.

For existing projects on Node.js 20: Migrate to Node.js 22 LTS as soon as possible.

Deadline: Before April 30, 2026.

Don't wait until the last moment - rushed migrations often cause production problems. Start planning now.

If you're interested in JavaScript runtimes, I recommend checking out another article: Bun vs Node.js in 2026: Is It Worth Migrating? where you'll discover interesting alternatives to Node.js.

Let's go! 🦅