| Package | Affected versions | Patched versions |
|---|
| next.js | ≥ 15.3.0, < 15.3.3
| 15.3.3
|
| vercel | ≥ 41.4.1, < 42.2.0
| 42.2.0
|
| next npm | ≥ 15.3.0, < 15.3.3
| 15.3.3
|
Description
Summary
A cache poisoning issue in Next.js App Router >=15.3.0 and < 15.3.3 may have allowed RSC payloads to be cached and served in place of HTML, under specific conditions involving middleware and redirects. This issue has been fixed in Next.js 15.3.3.
Users on affected versions should upgrade immediately and redeploy to ensure proper caching behavior.
More details: CVE-2025-49005
NVD description
Next.js is a React framework for building full-stack web applications. In Next.js App Router from 15.3.0 to before 15.3.3 and Vercel CLI from 41.4.1 to 42.2.0, a cache poisoning vulnerability was found. The issue allowed page requests for HTML content to return a React Server Component (RSC) payload instead under certain conditions. When deployed to Vercel, this would only impact the browser cache, and would not lead to the CDN being poisoned. When self-hosted and deployed externally, this could lead to cache poisoning if the CDN does not properly distinguish between RSC / HTML in the cache keys. This issue has been resolved in Next.js 15.3.3.
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