## Vercel Issues Emergency Patch for Critical RCE Vulnerability in React Server Components Affecting Next.js Deployments
A critical remote code execution vulnerability has been identified in React Server Components, affecting production deployments across frameworks including Next.js. The flaw stems from insecure deserialization within the React Flight protocol, enabling unauthenticated attackers to execute arbitrary code on affected servers. Vercel has automatically generated patch pull requests for at-risk projects within its platform, signaling urgency around the exposure.

The vulnerability specifically targets the project tv-tracker-wt79, hosted on Vercel's infrastructure, though the underlying flaw impacts the broader React Server Components ecosystem. Security advisories tracking the issue include GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React advisory CVE-2025-55182, and Next.js advisory CVE-2025-66478. Vercel acknowledged that its automated fix may not be comprehensive and has urged project maintainers to review additional guidance before merging the proposed changes. The incomplete nature of the automated patch suggests manual verification may be necessary for high-value targets.

The disclosure raises significant concerns for organizations running React-based server-side rendering at scale. Applications leveraging React Server Components for streaming data or server-side state management could be particularly exposed if they process untrusted input through the affected serialization path. Security teams are advised to audit their Vercel and Next.js deployments immediately, cross-reference their versions against the published advisories, and apply patches with careful testing. The proliferation of automated deployment pipelines on Vercel's platform may accelerate both patch adoption and potential exploitation if attackers move faster than development teams.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: react, next.js, vercel, rce, cve
- **Credibility**: unverified
- **Published**: 2026-04-26 15:54:11
- **ID**: 77207
- **URL**: https://whisperx.ai/en/intel/77207