{"id":"CVE-2024-37890","aliases":["GHSA-3h5v-q93c-6h6q"],"url":"https://o3.security/vulnerability/CVE-2024-37890","summary":"Denial of service when handling a request with many HTTP headers in ws","details":"ws is an open source WebSocket client and server for Node.js. A request with a number of headers exceeding theserver.maxHeadersCount threshold could be used to crash a ws server. The vulnerability was fixed in ws@8.17.1 (e55e510) and backported to ws@7.5.10 (22c2876), ws@6.2.3 (eeb76d3), and ws@5.2.4 (4abd8f6). In vulnerable versions of ws, the issue can be mitigated in the following ways: 1. Reduce the maximum allowed length of the request headers using the --max-http-header-size=size and/or the maxHeaderSize options so that no more headers than the server.maxHeadersCount limit can be sent. 2. Set server.maxHeadersCount to 0 so that no limit is applied.","published":"2024-06-17T19:09:02.127Z","modified":"2026-07-15T01:49:15.696696287Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"ws","fixedVersion":"5.2.4"},{"ecosystem":"npm","name":"ws","fixedVersion":"6.2.3"},{"ecosystem":"npm","name":"ws","fixedVersion":"7.5.10"},{"ecosystem":"npm","name":"ws","fixedVersion":"8.17.1"}],"fix":{"url":"https://github.com/websockets/ws/commit/22c28763234aa75a7e1b76f5c01c181260d7917f","label":"websockets/ws@22c2876"},"references":[{"type":"WEB","url":"https://nodejs.org/api/http.html#servermaxheaderscount"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/37xxx/CVE-2024-37890.json"},{"type":"ADVISORY","url":"https://github.com/websockets/ws/security/advisories/GHSA-3h5v-q93c-6h6q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-37890"},{"type":"REPORT","url":"https://github.com/websockets/ws/issues/2230"},{"type":"FIX","url":"https://github.com/websockets/ws/commit/22c28763234aa75a7e1b76f5c01c181260d7917f"},{"type":"FIX","url":"https://github.com/websockets/ws/commit/4abd8f6de4b0b65ef80b3ff081989479ed93377e"},{"type":"FIX","url":"https://github.com/websockets/ws/commit/e55e5106f10fcbaac37cfa89759e4cc0d073a52c"},{"type":"FIX","url":"https://github.com/websockets/ws/commit/eeb76d313e2a00dd5247ca3597bba7877d064a63"},{"type":"FIX","url":"https://github.com/websockets/ws/pull/2231"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:15.696696287Z"}}