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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| vercel | next.js | >= 15.3.0, < 15.3.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | jitsucom-jitsu +2 | 2.10.0-r2 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | next | >= 15.3.0, < 15.3.3 | 15.3.3 | GHSA-r2fc-ccr8-96c4 |
Advisories 1
- WID-SEC-2025-1456 Vercel Next.js: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 3, 2025
References
- https://github.com/vercel/next.js/security/advisories/GHSA-r2fc-ccr8-96c4
- https://github.com/vercel/next.js/issues/79346
- https://github.com/vercel/next.js/commit/ec202eccf05820b60c6126d6411fe16766ecc066
- https://github.com/vercel/next.js/releases/tag/v15.3.3
- https://vercel.com/changelog/cve-2025-49005