GHSA-fmh4-wr37-44fp: @vitejs/plugin rsc Remote Code Execution Vulnerability

CRITICAL
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CVSS 10.0
CWE-502
Published
Advisory Summary

GHSA-fmh4-wr37-44fp is a CRITICAL (CVSS 10.0) remote code execution vulnerability (CWE-502: Deserialization of Untrusted Data) affecting @vitejs/plugin rsc libraries in the npm ecosystem. The issue involves react server components are vulnerable to rce. Remediation is available by upgrading affected packages to version 0.5.3.

GHSA-fmh4-wr37-44fp at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-fmh4-wr37-44fp
Severity CRITICAL
CVSS v3.1 Base Score 10.0
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product @vitejs/plugin rsc
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 10.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix GHSA-fmh4-wr37-44fp

To remediate this vulnerability, upgrade all affected @vitejs/plugin rsc dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@vitejs/plugin-rsc fixed: 0.5.3 
npm install @vitejs/plugin-rsc@0.5.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls @vitejs/plugin-rsc

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-fmh4-wr37-44fp, inspect your project dependencies using npm:

npm ls @vitejs/plugin-rsc

Analyze the terminal output to locate any version of @vitejs/plugin rsc in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.5.3), your application is affected.

Note: The npm ls @vitejs/plugin-rsc command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In @vitejs/plugin rsc, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary `@vitejs/plugin-rsc` vendors `react-server-dom-webpack`, which contained an unauthenticated remote code execution vulnerability in versions prior to 19.0.1, 19.1.2, and 19.2.1. See details in React repository's advisory https://github.com/facebook/react/security/advisories/GHSA-fv66-9v8q-g76r ### Impact Applications using affected versions of `@vitejs/plugin-rsc` are vulnerable to unauthenticated remote code execution through deserialization of untrusted data. An attacker can execute arbitrary code remotely without authentication, affecting confidentiality, integrity, and availability. ### Recommendations Upgrade immediately to `@vitejs/plugin-rsc@0.5.3` or later. ### Workarounds Applications not using server-side React or React Server Components are unaffected.

GHSA-fmh4-wr37-44fp Affected @vitejs/plugin rsc Versions

1 component(s)
Fixed Versions:
0.5.3
Product / Package Ecosystem Affected Versions Fixed Version
@vitejs/plugin-rsc
npm/@vitejs/plugin-rsc
npm
< 0.5.3
0.5.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/facebook/react/security/advisories/GHSA-fv66-9v8q-g76r
GitHub Advisory / Wiki ADVISORY
https://github.com/vercel/next.js/security/advisories/GHSA-9qr9-h5gf-34mp
GitHub Advisory / Wiki ADVISORY
https://github.com/vitejs/vite-plugin-react/security/advisories/GHSA-fmh4-wr37-44fp
@vitejs/plugin rsc Source Repository REPOSITORY
https://github.com/vitejs/vite-plugin-react
@vitejs/plugin rsc Security Information SECURITY
https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components

Frequently Asked Questions

What is GHSA-fmh4-wr37-44fp?
GHSA-fmh4-wr37-44fp is a security vulnerability in @vitejs/plugin rsc involving React Server Components are Vulnerable to RCE under CWE-502: Deserialization of Untrusted Data.
Which @vitejs/plugin rsc versions are affected?
Affected versions include releases prior to 0.5.3 across affected packages: @vitejs/plugin-rsc.
What version fixes GHSA-fmh4-wr37-44fp?
Upgrading to 0.5.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @vitejs/plugin-rsc affected?
Yes, @vitejs/plugin-rsc is affected in releases prior to 0.5.3. Upgrade your dependency to 0.5.3 or later.
What is the CVSS score of GHSA-fmh4-wr37-44fp?
GHSA-fmh4-wr37-44fp has a CVSS v3.1 base score of 10.0 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with GHSA-fmh4-wr37-44fp?
GHSA-fmh4-wr37-44fp is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check npm dependencies for GHSA-fmh4-wr37-44fp?
Run the dependency tree command: 'npm ls @vitejs/plugin-rsc'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fmh4-wr37-44fp",
  "modified" : "2025-12-11T18:20:18Z",
  "published" : "2025-12-03T19:07:52Z",
  "aliases" : [ ],
  "summary" : "React Server Components are Vulnerable to RCE",
  "details" : "### Summary\n\n`@vitejs/plugin-rsc` vendors `react-server-dom-webpack`, which contained an unauthenticated remote code execution vulnerability in versions prior to 19.0.1, 19.1.2, and 19.2.1. See details in React repository's advisory https://github.com/facebook/react/security/advisories/GHSA-fv66-9v8q-g76r\n\n### Impact\n\nApplications using affected versions of `@vitejs/plugin-rsc` are vulnerable to unauthenticated remote code execution through deserialization of untrusted data. An attacker can execute arbitrary code remotely without authentication, affecting confidentiality, integrity, and availability.\n\n### Recommendations\n\nUpgrade immediately to `@vitejs/plugin-rsc@0.5.3` or later.\n\n### Workarounds\n\nApplications not using server-side React or React Server Components are unaffected.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@vitejs/plugin-rsc"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.5.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.5.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/facebook/react/security/advisories/GHSA-fv66-9v8q-g76r"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vercel/next.js/security/advisories/GHSA-9qr9-h5gf-34mp"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vitejs/vite-plugin-react/security/advisories/GHSA-fmh4-wr37-44fp"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vitejs/vite-plugin-react"
  }, {
    "type" : "WEB",
    "url" : "https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-12-03T19:07:52Z",
    "nvd_published_at" : null
  }
}