Full Report
The open-source code library is one of the most extensively used application frameworks. Wiz found vulnerable versions in around 39% of cloud environments. The post Developers scramble as critical React flaw threatens major apps appeared first on CyberScoop.
Analysis Summary
# Vulnerability: Critical Deserialization Flaw in React Server Components (RSC)
## CVE Details
- CVE ID: CVE-2025-55182
- CVSS Score: (Severity not explicitly provided in text, but described as **"critical"** and leading to RCE)
- CWE: Deserialization of Untrusted Data (Inferred from "deserialization defect")
## Affected Systems
- Products: React Server Components (The core library).
- Versions: All vulnerable versions prior to patching.
- Configurations: Exploitation is possible in **default configurations**.
## Vulnerability Description
This vulnerability is described as a **deserialization defect** within React Server Components (RSC). Successful exploitation allows unauthenticated attackers to achieve **Remote Code Execution (RCE)** on the server, leading to privilege escalation or network pivoting. The impact includes potential devastation if access keys, secrets, or sensitive information are present on the compromised system.
## Exploitation
- Status: **Expected soon**. While no attacks have been observed or reported as of disclosure, researchers expect exploitation to be "truly imminent."
- Complexity: **Trivial** to exploit.
- Attack Vector: Remote/Network (Allows unauthenticated remote attackers).
## Impact
- Confidentiality: High (Access to secrets/sensitive information on the system).
- Integrity: High (Potential for privilege escalation/pivoting).
- Availability: High (System compromise possible).
## Remediation
### Patches
- The React team has created a patch for the upstream vulnerability (CVE-2025-55182).
- **Next.js** (a dependent product) has disclosed and issued a patch for its own related vulnerability, **CVE-2025-66478**. Developers should check specific framework advisories.
### Workarounds
- Sharing of temporary mitigation steps included the implementation of **Web Application Firewall (WAF) rules**.
## Detection
- **Detection Methods**: Specific IOCs or signatures were not detailed, but detection scope involves identifying deployments using vulnerable versions of React Server Components within the application framework stack.
- **Scope Warning**: Wiz found vulnerable versions in approximately **39% of cloud environments**. Fallout is expected across dependent libraries and frameworks.
## References
- [React Blog Post on the Vulnerability](https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components)
- [Next.js Advisory for related CVE](https://vercel.com/changelog/cve-2025-55182)
- [Wiz vulnerability analysis summary](https://www.wiz.io/blog/critical-vulnerability-in-react-cve-2025-55182)