The world is in shock as one of the most widely used JavaScript libraries just announced that they have discovered a security issue in the React Server Components, which are one of the most commonly used parts of modern web development. The issue has been identified as CVE-2025-55182. Reports say that this bug allows attackers to take control of servers without needing a password or any user action. As per reports, the flaw arose from the way React handles certain data that is sent to the server functions. Popular frameworks like Next.js, React Router and others rely on the affected React packages, which means many websites and services around the world are exposed. Security firms warn that this is a high-risk issue that must be fixed immediately by updating to the latest patched versions.
This newly discovered vulnerability has triggered a swift and urgent response from companies, developers, and hosting providers. The issue affects React Server Components in versions 19.0, 19.1, 19.1.1, and 19.2.0; however, React was quick to release the updates for the fix, notably 19.0.1, 19.1.2, and 19.2.1.
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According to Wiz, a cybersecurity company, almost 40 percent of cloud setups contain systems running vulnerable versions. Next.js alone appears in most cloud environments, and more than half of those are open to the public, which increases the danger. Their tests showed that attacks using this flaw are extremely reliable and can lead to full control of a server.
While the developers rushed to update their systems, hosting platforms also introduced temporary protections. Among the fastest to act was Cloudflare. Daniele Molteni, Cloudflare’s Director of Product Management, announced in a blog post that the company has deployed a new security rule across its global network.
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The company said that the newly updated rule blocks attempts to exploit the vulnerability for all Cloudflare users, including those on the free plan. The company ensured that anyone whose website traffic passes through Cloudflare’s firewall is automatically protected. In addition to that, they also confirmed that applications built on Cloudflare Workers do not face this risk because of how Workers handle data.
Cloudflare shared that it worked closely with security partners to study attack patterns and prepare strong, quick defences. The new rule is active by default, and the company plans to continue monitoring for new tricks attackers may try. The protections were rolled out on December 2, 2025, and so far no exploit attempts have been observed.