fix-react2shell-next

!fix-react2shell-next

One command to fix CVE-2025-66478 (React 2 Shell RCE) in your Next.js / React RSC app.

``bash
npx fix-react2shell-next
`

Deterministic version bumps per the official advisories.

What it does

1. Recursively scans all package.json files (handles monorepos)
2. Checks for vulnerable versions of:
- next
- react-server-dom-webpack
- react-server-dom-parcel
- react-server-dom-turbopack
3. Patches to the correct fixed version based on your current version
4. Refreshes your lockfile with the detected package manager

Affected Versions

$3

| Current Version | Patched Version |
|-----------------|-----------------|
| 15.0.0 – 15.0.4 | 15.0.5 |
| 15.1.0 – 15.1.8 | 15.1.9 |
| 15.2.0 – 15.2.5 | 15.2.6 |
| 15.3.0 – 15.3.5 | 15.3.6 |
| 15.4.0 – 15.4.7 | 15.4.8 |
| 15.5.0 – 15.5.6 | 15.5.7 |
| 16.0.0 – 16.0.6 | 16.0.7 |
| 15.x canaries | 15.6.0-canary.58 |
| 16.x canaries | 16.1.0-canary.12 |
| 14.3.0-canary.77+ | Downgrade to 14.3.0-canary.76 or upgrade to 15.0.5 |

$3

| Current Version | Patched Version |
|-----------------|-----------------|
| 19.0.0 | 19.0.1 |
| 19.1.0, 19.1.1 | 19.1.2 |
| 19.2.0 | 19.2.1 |

Usage

$3

`bash
npx fix-react2shell-next
`

$3

`bash
npx fix-react2shell-next --fix
`

$3

`bash
npx fix-react2shell-next --dry-run
`

$3

`bash
npx fix-react2shell-next --json
`

Example Output

`
🔍 fix-react2shell-next - CVE-2025-66478 vulnerability scanner

📂 Found 3 package.json file(s)

🚨 Found 2 vulnerable file(s):

📄 package.json
next: ^15.1.0 → 15.1.9

📄 apps/web/package.json
next: ^15.4.3 → 15.4.8
react-server-dom-webpack: 19.1.0 → 19.1.2

🔧 Apply fixes? [Y/n] y

🔧 Applying fixes...

✓ Updated package.json
✓ Updated apps/web/package.json

📦 Package manager: pnpm
🔄 Refreshing lockfile...

$ pnpm install

✅ Patches applied!
Remember to test your app and commit the changes.
`

Monorepo Support

The tool automatically finds all package.json files in your project, excluding:
- node_modules
- .next, .turbo, .vercel, .nuxt
- dist, build, .output
- coverage`

Works with npm, yarn, pnpm, and bun workspaces.

References

- GitHub Advisory GHSA-9qr9-h5gf-34mp
- Next.js Security Advisory
- React Security Advisory

License

MIT