{"id":"CVE-2026-69185","aliases":["GHSA-2m8v-j782-fhvr"],"url":"https://o3.security/vulnerability/CVE-2026-69185","summary":"Socket.IO: Zero-attachment Memory Exhaustion","details":"### Impact\n\nA specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory.\n\n### Patches\n\n| Version range    | Used by                                    | Fixed version |\n|------------------|--------------------------------------------|---------------|\n| `>=4.0.0 <4.2.7` | `socket.io@4.x` and `socket.io-client@4.x` | `4.2.7`       |\n| `>=3.4.0 <3.4.5` | `socket.io@2.x`                            | `3.4.5`       |\n| `<3.3.6`         | `socket.io-client@2.x`                     | `3.3.6`       |\n\n### Workarounds\n\nThere is no known workaround except upgrading to a safe version.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n- Open a discussion [here](https://github.com/socketio/socket.io/discussions)","published":"2026-08-03T19:09:10.073Z","modified":"2026-10-28T02:30:23.354312079Z","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":{"score":0.00503,"percentile":0.41886,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"socket.io-parser","fixedVersion":"4.2.7"},{"ecosystem":"npm","name":"socket.io-parser","fixedVersion":"3.4.5"},{"ecosystem":"npm","name":"socket.io-parser","fixedVersion":"3.3.6"}],"fix":{"url":"https://github.com/socketio/socket.io/commit/7c6ef571a00656718e9e05e3b948fd1758b2a7b4","label":"socketio/socket.io@7c6ef57"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69185.json"},{"type":"ADVISORY","url":"https://github.com/socketio/socket.io/security/advisories/GHSA-2m8v-j782-fhvr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-69185"},{"type":"FIX","url":"https://github.com/socketio/socket.io/commit/7c6ef571a00656718e9e05e3b948fd1758b2a7b4"},{"type":"FIX","url":"https://github.com/socketio/socket.io/commit/9c6323e5cde41bd75df3379b5fc9293664a5f240"},{"type":"FIX","url":"https://github.com/socketio/socket.io/commit/ced94ffa3ac020a8f3c14eb98a3bf34acb14d291"},{"type":"PACKAGE","url":"https://github.com/socketio/socket.io"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:23.354312079Z"}}