Introduction
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a critical vulnerability affecting React Server Components (RSC) to its Known Exploited Vulnerabilities catalog. Identified as CVE-2025-55182, this security flaw poses a significant risk due to its potential for remote code execution by unauthorized attackers.
Key Details
- Who: CISA and the React development community.
- What: A critical vulnerability (CVSS score: 10.0) that allows unauthenticated remote code execution via insecure deserialization.
- When: Added to the KEV catalog on December 5, 2025.
- Where: Impacts React Server Components, along with frameworks like Next.js and React Router, affecting about 2.15 million internet-facing services.
- Why: Attack attempts have already been detected from groups linked to malicious activities, indicating the urgency of addressing this flaw.
- How: The vulnerability arises from how React decodes payloads sent to its server functions, allowing attackers to execute arbitrary commands by sending specially crafted HTTP requests.
Why It Matters
This vulnerability poses major challenges across several areas:
- Enterprise Security: Organizations must prioritize patching systems to prevent exploitation.
- Multi-cloud Strategies: Impact on applications deployed in hybrid or multi-cloud environments increases risk exposure.
- Storage Operations: Unaddressed vulnerabilities could lead to data breaches, affecting data integrity and confidentiality.
Takeaway for IT Teams
IT professionals should urgently assess their environments for the CVE-2025-55182 vulnerability and apply updates to affected libraries, specifically versions 19.0.1, 19.1.2, and 19.2.1. Proactive measures are essential to ensure security and mitigate potential threats.
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