Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. These vulnerabilities are triggered by sending specially crafted HTTP requests to Server Function endpoints. Depending on the vulnerable code path being exercised, the application configuration, and application code, this could lead to server crashes, out-of-memory exceptions, or excessive CPU usage. Organizations should prioritize patching immediately.
The CVSS score for this vulnerability is 7.5, indicating high severity. This level of severity signifies a significant risk to organizations that utilize the affected components. As the vulnerabilities can be exploited remotely, the risk to organizations includes potential downtimes and service disruptions, particularly for applications using React Server Components.
Given the potential impact, organizations are strongly encouraged to consider upgrading to the latest package versions to reduce risk and prevent availability issues in applications that use React Server Components.
The urgency for defenders is high, as these vulnerabilities may be exploited in the wild, leading to significant operational challenges. Organizations must remain vigilant and take proactive measures to secure their systems.
Vulnerability Details
The vulnerabilities in question are categorized under CWE-400 (Uncontrolled Resource Consumption) and CWE-502 (Deserialization of Untrusted Data). The vulnerabilities are primarily associated with the handling of specially crafted HTTP requests, which exploit the server components' processing capabilities.
The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, emphasizing its high impact on availability while having no impact on confidentiality or integrity.
Affected products include all versions of React prior to the vendor patch. Organizations should check their implementations against the severity and exploitability of these vulnerabilities.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of input requests to Server Function endpoints, creating conditions that allow attackers to overload the server. Attackers may leverage this vulnerability to send a high volume of requests that lead to resource exhaustion.
The attack vector is classified as NETWORK, with low attack complexity, requiring no privileges and no user interaction. This makes it easier for attackers to exploit the vulnerability remotely. The impact on availability is significant, as the server may become unresponsive or crash.
Risk & Impact Analysis
Real-world deployment risk is considerable, particularly for applications that rely heavily on React Server Components. The blast radius potential is high, as multiple endpoints may be affected, leading to widespread service disruptions.
This vulnerability matters to organizations as it threatens the availability of their services and can lead to customer dissatisfaction and potential loss of revenue. Organizations should assess their exposure to this vulnerability based on their use of the affected React components.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include all versions of React from 19.0.0 to 19.0.4, 19.1.0 to 19.1.5, and 19.2.0 to 19.2.4. Organizations should check their installations and upgrade to patched versions as soon as possible.
Mitigation & Remediation
Organizations should upgrade to the latest versions of the affected packages to mitigate risks associated with these vulnerabilities. For those unable to update immediately, implementing strict input validation on HTTP requests sent to Server Function endpoints may provide a temporary workaround.
Consider engaging in penetration testing to identify other potential weaknesses that may exist in your applications.
Detection Guidance
Monitor logs for unusual patterns of requests to Server Function endpoints that may indicate attempts to exploit this vulnerability. Look for spikes in CPU usage or memory consumption that may correlate with these requests.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential to disrupt services for organizations using React Server Components. As the use of server-side rendering becomes more prevalent, understanding the patterns of these vulnerabilities will be crucial for security teams.
Security teams should take this opportunity to reevaluate their security practices around server components and consider implementing additional monitoring tools to detect anomalies in application performance.
For further insights into application security, consider reviewing our resources on penetration testing methodologies and best practices.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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