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- CVE-2025-55182 is a critical security flaw in React Server Components.
- It permits unauthenticated remote code execution on affected servers.
- The vulnerability stems from insecure deserialization of server actions.
- Input validation failures allow malicious data to reach execution engines.
- Attackers transmit crafted payloads via standard HTTP POST requests.
- The application processes these payloads without adequate sanity checks.
7. Unsafe evaluation functions execute the attacker-supplied instructions.
- This compromises the entire server environment hosting the application.
- Affected frameworks include Next.js and various custom implementations.
- The Common Vulnerability Scoring System rates this flaw at 10.0.
- Attack complexity is extremely low, requiring zero authentication.
12. Confidentiality, integrity, and availability are entirely compromised.
13. Public proof-of-concept exploits emerged shortly after disclosure.
- Automated botnets began scanning for vulnerable endpoints instantly.
- Defenders faced immense pressure to deploy emergency patches.
- The flaw affects specific pre-release and stable version branches.
- Developers must verify package trees using dependency audit tools.
- Transient dependencies can also introduce the vulnerability silently.
- Upgrading core packages remains the only definitive remediation step.
- Security advisories were published simultaneously by major maintainers.
- Incident response teams reported widespread probing of web apps.
- System administrators checked logs for anomalous execution traces.
- Privileges attained match the user running the Node process.
24. Containerized deployments offer limited containment without isolation.
- Web application firewalls can block known exploit signatures.
- Zero-day usage was suspected prior to official public disclosure.
- Code review practices must include secure deserialization checks.
28. Automated dependency updaters prevent prolonged exposure windows.
- Thorough testing ensures patches do not break application logic.
- Vigilance against supply chain and framework flaws is paramount.
DailyCVE Form:
Platform: React Server Components
Version: Versions 19.0-19.2
Vulnerability: Remote Code Execution
Severity: Critical
date: December 3 2025
Prediction: Patched December 2025
What Undercode Say:
Analysis of CVE-2025-55182 reveals deep architectural vulnerabilities in modern JavaScript server runtimes. Automated telemetry indicates widespread scanning activity targeting endpoints handling server actions. Threat actors leverage automated scripts to identify exposed React Server Component endpoints. Code analysis shows that failure to restrict prototype access during deserialization enables arbitrary command execution.
Exploit: (Educational Purposes!)
npx react-rsc-vuln-scanner /path/to/project
curl -X POST http://target-app/api/_rsc -d '{"action": "malicious_payload"}'
import requests
payload = {"action": "<strong>proto</strong>", "value": "exploit_code"}
response = requests.post("http://target-app/api/_rsc", json=payload)
print(response.text)
Protection: from this CVE
Upgrade React packages immediately to version 19.0.2, 19.1.3, or 19.2.2.
Audit all direct and transitive dependencies using dependency scanning tools.
Implement strict input validation and sanitization for all server actions.
Deploy Web Application Firewall rules to detect and block malicious payloads.
Impact:
Complete remote code execution leading to full server compromise.
Potential data exfiltration, database corruption, and malware deployment.
Loss of confidentiality, integrity, and availability of web services.
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Sources:
Reported By: github.com
Extra Source Hub:
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