Security Assessment: CVE-2025-55182 (React Server Components)

Assessment Date: 2025-12-07 Assessed By: Security Review Process Status: NOT AFFECTED

Executive Summary

This application is NOT affected by CVE-2025-55182 (React Server Components vulnerability) and CVE-2025-66478 (Next.js vulnerability).

The vulnerability affects React 19 and Next.js versions 15.0.0 through 16.x. This project runs on Next.js 14.2.16 and React 18.3.1, which are not impacted by this security issue.

Current Application Versions

Package	Version	Affected Versions	Status
next	14.2.16	15.0.0 - 16.x	NOT AFFECTED
react	18.3.1	19.x	NOT AFFECTED
react-dom	18.3.1	19.x	NOT AFFECTED

Vulnerability Details

CVE-2025-55182 - React Server Components

A critical vulnerability was discovered in React Server Components that could potentially allow unauthorized access or data exposure in applications using React 19’s server component architecture.

CVE-2025-66478 - Next.js

Related vulnerability affecting Next.js versions that implement React Server Components (versions 15.0.0 through 16.x).

Patched Versions

Next.js (if upgrading in future):

15.0.5
15.1.9
15.2.6
15.3.6
15.4.8
15.5.7
16.0.7

React (if upgrading in future):

19.0.1
19.1.2
19.2.1

Vercel Security Notification (Reference)

A critical vulnerability in React Server Components (CVE-2025-55182) has been responsibly disclosed. It affects React 19 and frameworks that use it, including Next.js (CVE-2025-66478).

If you are using Next.js, every version between Next.js 15 and 16 is affected, and we recommend immediately updating to the latest Next.js versions containing the appropriate fixes (15.0.5, 15.1.9, 15.2.6, 15.3.6, 15.4.8, 15.5.7, 16.0.7).

If you are using another framework using Server Components, we also recommend immediately updating to the latest React versions containing the appropriate fixes (19.0.1, 19.1.2, and 19.2.1).

Why This Application Is Not Affected

Next.js Version: This application uses Next.js 14.2.16, which predates the affected versions (15.0.0+). React Server Components in Next.js 14 use a different implementation that is not vulnerable to this CVE.
React Version: This application uses React 18.3.1. The vulnerability specifically affects React 19’s Server Components implementation.
No Server Components (RSC) with Vulnerable Code Paths: The vulnerable code paths introduced in React 19 and Next.js 15 are not present in the versions used by this application.

Future Upgrade Considerations

When planning a future upgrade to Next.js 15 or React 19, the following precautions must be taken:

Mandatory Requirements

Next.js 15 Upgrade: Must use version 15.0.5 or later to avoid CVE-2025-66478
React 19 Upgrade: Must use version 19.0.1 or later to avoid CVE-2025-55182

Recommended Upgrade Path

# When upgrading to Next.js 15, ensure patched version:
npm install next@15.0.5 react@19.0.1 react-dom@19.0.1

# Or use the latest stable versions:
npm install next@latest react@latest react-dom@latest

Pre-Upgrade Checklist

Verify target Next.js version is 15.0.5+ or 16.0.7+
Verify target React version is 19.0.1+
Review Next.js 15 migration guide for breaking changes
Review React 19 migration guide for breaking changes
Run full test suite after upgrade
Test all Server Components functionality
Verify authentication flows work correctly
Check for any deprecated API usage

Conclusion

No action is required at this time. This security assessment is documented for audit trail purposes and to inform future upgrade decisions.

The application remains secure on Next.js 14.2.16 and React 18.3.1. When upgrading to newer versions in the future, ensure the patched versions listed above are used.

Document History

Date	Action	Author
2025-12-07	Initial security assessment created	Security Review