CISA has accelerated the patching deadline for React2Shell (CVE-2025-55182), a critical vulnerability with a CVSS score of 10.0 affecting React Server Components and frameworks like Next.js. The flaw allows unauthenticated remote code execution through unsafe deserialization. Since disclosure on December 3, 2025, threat actors have conducted widespread exploitation with over 35,000 attempts recorded in a single day, targeting government sites, critical infrastructure, and technology companies. Over 137,000 vulnerable IP addresses remain exposed globally, with attackers deploying cryptocurrency miners, botnet malware, and conducting reconnaissance for supply chain attacks.