Arbitrary Code Injection Affecting next package, versions >=14.3.0-canary.77 <15.0.5>=15.1.0 <15.1.9>=15.2.0-canary.0 <15.2.6>=15.3.0-canary.0 <15.3.6>=15.4.0-canary.0 <15.4.8>=15.5.1-canary.0 <15.5.7>=16.0.0-beta.0 <16.0.7
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- published3 Dec 2025
- disclosed3 Dec 2025
- creditLachlan Davidson
Introduced: 3 Dec 2025
NewCVE-2025-66478 (opens in a new tab)How to fix?
Upgrade next to version 15.0.5, 15.1.9, 15.2.6, 15.3.6, 15.4.8, 15.5.7, 16.0.7 or higher.
Overview
next is a react framework.
Affected versions of this package are vulnerable to Arbitrary Code Injection via unsafe deserialization of RSC payloads from HTTP requests to Server Function endpoints. An unauthenticated attacker can execute arbitrary code on the server by sending malicious HTTP requests.
Note:
Serverless applications and applications that do not use a framework, bundler, or bundler plugin that supports React Server Components are not affected by this vulnerability.
Next.js 13.x, Next.js 14.x stable, Pages Router applications, and the Edge Runtime are not affected.
This vulnerability originates in the upstream React implementation CVE-2025-55182. This advisory (CVE-2025-66478) tracks the downstream impact on Next.js applications using the App Router.