Security | Threat Detection | Cyberattacks | DevSecOps | Compliance

On December 3, 2025, the React team disclosed CVE-2025-55182, a critical remote code execution vulnerability in React Server Components. The flaw carries a CVSS score of 10.0, the maximum severity rating. What makes this vulnerability particularly dangerous is its simplicity: attackers only need to send a single crafted HTTP request to gain complete control over vulnerable servers. No authentication required. No complex exploit chains. Just one malicious request.

On December 3 2025, the React team released patched versions of the affected React Server Components packages. Framework vendors, including Next.js, provided updated builds on the same day. Any environment using React Server Components or frameworks that embed the RSC pipeline should.

On 29 November 2025, researcher Lachlan Davidson reported a critical React vulnerability that allows unauthenticated remote code execution via specially crafted React Server Function payloads. This vulnerability was disclosed as CVE-2025-55182 (React) and CVE-2025-66478 (Next.js) and is rated CVSS 10.0. A public proof concept has also been released so patching is of utmost importance.

Designated CVE-2025-55182 and widely dubbed "React2Shell," this vulnerability represents a worst-case scenario for modern web applications: Unauthenticated Remote Code Execution (RCE) on default configurations.

Cloudflare has deployed a new protection to address a vulnerability in React Server Components (RSC). All Cloudflare customers are automatically protected, including those on free and paid plans, as long as their React application traffic is proxied through the Cloudflare Web Application Firewall (WAF). Cloudflare Workers are inherently immune to this exploit. React-based applications and frameworks deployed on Workers are not affected by this vulnerability.

On December 3, 2025, coordinated disclosures revealed that multiple releases of React 19 and Next.js contain a critical flaw in the React Server Components (RSC) “Flight” protocol, allowing unauthenticated remote code execution (RCE). The vulnerability originates from unsafe deserialization of attacker-controlled data in server-side RSC payload handling.

Artificial Intelligence (AI) is transforming software development with agentic coding tools like GitHub Copilot and Cursor, leading the charge. These tools use AI to assist developers in writing code, automate repetitive tasks, and expedite the development process.

JFrog Security Research found 3 zero-day critical vulnerabilities in PickleScan, which would allow attackers to bypass the most popular Pickle model scanning tool. PickleScan is a widely used, industry-standard tool for scanning ML models and ensuring they contain no malicious content.

Unexpected attacks are the hardest to fend off. In the realm of cyber, Zero Day vulnerabilities are among the greatest risks, as these software flaws are unknown and exploited before a fix is available, potentially compromising the thousands of organizations that are unwittingly using vulnerable software.