{"id":"GHSA-2m8v-j782-fhvr","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| `\u003e=4.0.0 \u003c4.2.7` | `socket.io@4.x` and `socket.io-client@4.x` | `4.2.7`       |\n| `\u003e=3.4.0 \u003c3.4.5` | `socket.io@2.x`                            | `3.4.5`       |\n| `\u003c3.3.6`         | `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)","aliases":["CVE-2026-69185"],"modified":"2026-09-10T03:50:53.268104584Z","published":"2026-08-03T19:09:44Z","database_specific":{"cwe_ids":["CWE-20","CWE-754"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-08-03T19:09:44Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/socketio/socket.io/security/advisories/GHSA-2m8v-j782-fhvr"},{"type":"WEB","url":"https://github.com/socketio/socket.io/commit/7c6ef571a00656718e9e05e3b948fd1758b2a7b4"},{"type":"WEB","url":"https://github.com/socketio/socket.io/commit/9c6323e5cde41bd75df3379b5fc9293664a5f240"},{"type":"WEB","url":"https://github.com/socketio/socket.io/commit/ced94ffa3ac020a8f3c14eb98a3bf34acb14d291"},{"type":"PACKAGE","url":"https://github.com/socketio/socket.io"}],"affected":[{"package":{"name":"socket.io-parser","ecosystem":"npm","purl":"pkg:npm/socket.io-parser"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.2.7"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-2m8v-j782-fhvr/GHSA-2m8v-j782-fhvr.json"}},{"package":{"name":"socket.io-parser","ecosystem":"npm","purl":"pkg:npm/socket.io-parser"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.4.0"},{"fixed":"3.4.5"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-2m8v-j782-fhvr/GHSA-2m8v-j782-fhvr.json"}},{"package":{"name":"socket.io-parser","ecosystem":"npm","purl":"pkg:npm/socket.io-parser"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.3.6"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-2m8v-j782-fhvr/GHSA-2m8v-j782-fhvr.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}