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.
Metrics
Affected Vendors & Products
References
History
Tue, 08 Jul 2025 15:15:00 +0000
Type | Values Removed | Values Added |
---|---|---|
Metrics |
ssvc
|
Fri, 04 Jul 2025 00:30:00 +0000
Type | Values Removed | Values Added |
---|---|---|
References |
| |
Metrics |
threat_severity
|
threat_severity
|
Thu, 03 Jul 2025 21:15:00 +0000
Type | Values Removed | Values Added |
---|---|---|
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. | |
Title | Next.js cache poisoning due to omission of Vary header | |
Weaknesses | CWE-444 | |
References |
|
|
Metrics |
cvssV3_1
|

Status: PUBLISHED
Assigner: GitHub_M
Published: 2025-07-03T21:01:14.743Z
Updated: 2025-07-08T14:34:12.642Z
Reserved: 2025-05-29T16:34:07.175Z
Link: CVE-2025-49005

Updated: 2025-07-08T14:34:04.406Z

Status : Awaiting Analysis
Published: 2025-07-03T21:15:26.787
Modified: 2025-07-08T16:19:11.700
Link: CVE-2025-49005
