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Uninitialized memory disclosure\n### Impact\n\nThe `websocket.close()` implementation is vulnerable to uninitialized memory disclosure when a `TypedArray` is passed as the reason argument.\n\n### Proof of concept\n\n```js\nimport { deepStrictEqual } from 'node:assert';\nimport { WebSocket, WebSocketServer } from 'ws';\n\nconst wss = new WebSocketServer(\n  { port: 0, skipUTF8Validation: true },\n  function () {\n    const { port } = wss.address();\n    const ws = new WebSocket(`ws://localhost:${port}`, {\n      skipUTF8Validation: true\n    });\n\n    ws.on('close', function (code, reason) {\n      deepStrictEqual(reason, Buffer.alloc(80));\n    });\n  }\n);\n\nwss.on('connection', function (ws) {\n  ws.close(1000, new Float32Array(20));\n});\n```\n\n### Patches\n\nThe vulnerability was fixed in ws@8.20.1 (https://github.com/websockets/ws/commit/c0327ec15a54d701eb6ccefaa8bef328cfc03086).\n\n### Credits\n\nCredit for the private and responsible disclosure of this issue goes to [Nikita Skovoroda](https://github.com/ChALkeR).\n\n### Remarks\n\nAlthough 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.\n\n### Resources\n\n- https://github.com/advisories/GHSA-58qx-3vcg-4xpx\n- https://www.cve.org/CVERecord?id=CVE-2026-45736","references":[{"reference_url":"https://github.com/websockets/ws","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/websockets/ws"},{"reference_url":"https://github.com/websockets/ws/commit/c0327ec15a54d701eb6ccefaa8bef328cfc03086","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/websockets/ws/commit/c0327ec15a54d701eb6ccefaa8bef328cfc03086"},{"reference_url":"https://github.com/websockets/ws/security/advisories/GHSA-58qx-3vcg-4xpx","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/websockets/ws/security/advisories/GHSA-58qx-3vcg-4xpx"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45736","reference_id":"","reference_type":"","scores":[{"value":"4.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45736"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1136804","reference_id":"1136804","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1136804"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/119231?format=json","purl":"pkg:deb/debian/node-ws@8.20.1%2B~cs14.19.1-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-ws@8.20.1%252B~cs14.19.1-1%3Fdistro=trixie"}],"aliases":["CVE-2026-45736","GHSA-58qx-3vcg-4xpx"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-bqh9-yun3-vfch"}],"fixing_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/40754?format=json","vulnerability_id":"VCID-1h47-fru4-1ugx","summary":"Improper Restriction of Operations within the Bounds of a Memory Buffer\nA vulnerability was found in the ping functionality of the ws module before 1.0.0 which allowed clients to allocate memory by sending a ping frame. The ping functionality by default responds with a pong frame and the previously given payload of the ping frame. This is exactly what you expect, but internally ws always transforms all data that we need to send to a Buffer instance and that is where the vulnerability existed. ws didn't do any checks for the type of data it was sending. With buffers in node when you allocate it when a number instead of a string it will allocate the amount of bytes.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2016-10518","reference_id":"","reference_type":"","scores":[{"value":"0.00345","scoring_system":"epss","scoring_elements":"0.57301","published_at":"2026-06-04T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2016-10518"},{"reference_url":"https://gist.github.com/c0nrad/e92005446c480707a74a","reference_id":"","reference_type":"","scores":[{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://gist.github.com/c0nrad/e92005446c480707a74a"},{"reference_url":"https://github.com/websockets/ws/commit/29293ed11b679e0366fa0f6bb9310b330dafd795","reference_id":"","reference_type":"","scores":[{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/websockets/ws/commit/29293ed11b679e0366fa0f6bb9310b330dafd795"},{"reference_url":"https://github.com/websockets/ws/releases/tag/1.0.1","reference_id":"","reference_type":"","scores":[{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/websockets/ws/releases/tag/1.0.1"},{"reference_url":"https://nodesecurity.io/advisories/67","reference_id":"","reference_type":"","scores":[],"url":"https://nodesecurity.io/advisories/67"},{"reference_url":"https://www.npmjs.com/advisories/67","reference_id":"","reference_type":"","scores":[{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.npmjs.com/advisories/67"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2016-10518","reference_id":"CVE-2016-10518","reference_type":"","scores":[{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-10518"},{"reference_url":"https://github.com/advisories/GHSA-2mhh-w6q8-5hxw","reference_id":"GHSA-2mhh-w6q8-5hxw","reference_type":"","scores":[{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-2mhh-w6q8-5hxw"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/119229?format=json","purl":"pkg:deb/debian/node-ws@1.0.1%2Bds1.e6ddaae4-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-ws@1.0.1%252Bds1.e6ddaae4-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/119230?format=json","purl":"pkg:deb/debian/node-ws@7.4.2%2B~cs18.0.8-2?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-72v3-t5vr-w7hx"},{"vulnerability":"VCID-bqh9-yun3-vfch"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-ws@7.4.2%252B~cs18.0.8-2%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/119228?format=json","purl":"pkg:deb/debian/node-ws@8.11.0%2B~cs13.7.3-1?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-72v3-t5vr-w7hx"},{"vulnerability":"VCID-bqh9-yun3-vfch"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-ws@8.11.0%252B~cs13.7.3-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/119232?format=json","purl":"pkg:deb/debian/node-ws@8.18.1%2B~cs14.18.2-1?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-bqh9-yun3-vfch"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-ws@8.18.1%252B~cs14.18.2-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/119231?format=json","purl":"pkg:deb/debian/node-ws@8.20.1%2B~cs14.19.1-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-ws@8.20.1%252B~cs14.19.1-1%3Fdistro=trixie"}],"aliases":["CVE-2016-10518","GHSA-2mhh-w6q8-5hxw"],"risk_score":null,"exploitability":null,"weighted_severity":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-1h47-fru4-1ugx"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/40736?format=json","vulnerability_id":"VCID-cysr-5kex-7fb2","summary":"Improper Input Validation\nws is a \"simple to use, blazing fast and thoroughly tested websocket client, server and console for node.js, up-to-date against RFC-6455\". By sending an overly long websocket payload to a `ws` server, it is possible to crash the node process. 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