New React RSC Vulnerabilities Enable DoS and Source Code Exposure

The Hacker News

December 12, 2025 at 8:55 AM

Actively Exploited

Overview

The React team has identified and patched two significant vulnerabilities in React Server Components (RSC) that could lead to denial-of-service (DoS) attacks and exposure of source code. These issues were uncovered by security researchers while they were probing the existing patches for a previously disclosed critical bug (CVE-2025-55182) that had a CVSS score of 10.0, indicating its severity. This situation is concerning as it affects developers using React for building applications, potentially putting sensitive code at risk. The React team emphasizes the importance of applying these patches promptly to maintain application security.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: React Server Components (RSC) in various applications utilizing React framework.
Action Required: Users should apply the latest patches provided by the React team to address these vulnerabilities.
Timeline: Newly disclosed

Original Article Summary

The React team has released fixes for two new types of flaws in React Server Components (RSC) that, if successfully exploited, could result in denial-of-service (DoS) or source code exposure. The team said the issues were found by the security community while attempting to exploit the patches released for CVE-2025-55182 (CVSS score: 10.0), a critical bug in RSC that has since been weaponized in

Impact

React Server Components (RSC) in various applications utilizing React framework.

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Users should apply the latest patches provided by the React team to address these vulnerabilities. Specific patch numbers or versions were not mentioned in the article, but it is essential to keep the React framework updated to the latest version.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Exploit, Vulnerability, and 1 more.

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