CVE-2025-55183
Description
A flaw was found in React Server Components (RSC). This vulnerability allows an information leak, where a specifically crafted HTTP (Hypertext Transfer Protocol) request to a vulnerable Server Function can unsafely return its source code. Exploitation requires a Server Function that explicitly or implicitly exposes a stringified argument. A malicious HTTP request can be crafted and sent to any App Router endpoint that can return the compiled source code of Server Functions. This could reveal business logic, but would not expose secrets unless they were hardcoded directly into Server Function code.
Statement
No Red Hat software includes the directly affected React Server Components packages (react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack). However, the reference implementation of React Server Components is used by other projects such as Next.js. The packages listed here include Next.js as a dependency, but our analysis indicates that they are not affected by the vulnerability as they do not use the App Router functionality that exposes endpoints serving the vulnerable protocol that can return the compiled source code of Server Functions.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | Low | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | None | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
Frequently Asked Questions
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