This vulnerability allows a pre-authentication denial of service condition in Facebook's React Server Components versions 19.0.0, 19.0.1, 19.1.0, 19.1.1, 19.1.2, 19.2.0, and 19.2.1. The affected components include react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. The flaw lies in the unsafe deserialization of payloads from HTTP requests to Server Function endpoints, leading to infinite loops that can hang server processes and block future HTTP requests from being served.
With a CVSS score of 7.5, this vulnerability is classified as high severity. The potential impact is significant, as it may lead to prolonged service downtime, affecting user access to applications relying on these components. Organizations using affected versions should prioritize patching immediately.
Currently, this vulnerability has known exploits, making it essential for organizations to take immediate action to mitigate risks. The urgency for defenders is high, given the exploitation status.
Organizations utilizing Facebook's React and Vercel's Next.js should evaluate their applications for this vulnerability and plan appropriate remediation strategies.
Vulnerability Details
The vulnerability is described as a pre-authentication denial of service issue in React Server Components, which can be exploited by attackers sending crafted payloads to the server. The affected versions include those specified in the CVE details, specifically targeting versions prior to patches that address the vulnerability.
This vulnerability has been classified under CWE-502, indicating the root cause related to deserialization issues. Organizations must ensure they are not running any of the vulnerable versions to prevent exploitation.
Technical Analysis
The root cause of this vulnerability stems from the insecure handling of serialized data. Attackers may exploit this flaw by sending malicious payloads that, when deserialized, can lead to infinite loops on the server side. The attack vector is network-based, requiring no user interaction and no special privileges.
The attack complexity is low, as the vulnerability can be exploited without sophisticated techniques. This makes it a significant risk for organizations, particularly those with high-availability requirements.
Risk & Impact Analysis
Risk to organizations includes potential service outages and degraded performance, which can affect customer satisfaction and trust. The blast radius of this vulnerability is substantial, given the widespread use of React and Next.js in modern web applications.
Given the CVSS score of 7.5 and the existence of known exploits, organizations should address this vulnerability in their priority patch cycle to avoid operational disruptions.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of React Server Components include 19.0.0 through 19.2.1, specifically the packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. Organizations should ensure they are not using these versions or upgrade to the patched version as soon as possible.
Mitigation & Remediation
Organizations should immediately upgrade to the fixed versions of the affected components. If patches are not available, implementing network controls to restrict access to the vulnerable components may mitigate the risk. Additionally, organizations may consider performing an application security assessment to identify similar vulnerabilities in their environment.
For further guidance, organizations can explore our services, including application security assessments and penetration testing to validate the security posture.
Detection Guidance
Monitoring for unusual server behavior, such as unexpected process usage or request latency, can help detect exploitation attempts. Additionally, logging HTTP requests to Server Function endpoints may provide insight into potential attack patterns.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-55184 highlights the importance of secure deserialization practices in modern web frameworks. As organizations increasingly adopt frameworks like React and Next.js, maintaining a robust security posture becomes critical.
This vulnerability also serves as a reminder for security teams to implement comprehensive testing strategies, including static and dynamic analysis, to identify vulnerabilities early in the development lifecycle.
For more information on securing applications against similar vulnerabilities, consider reviewing our penetration testing methodology and explore our vulnerability management program design best practices.
By focusing on proactive measures and continuous improvement in security practices, organizations can better protect themselves against threats posed by vulnerabilities such as CVE-2025-55184.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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