{"id":"CVE-2026-54466","aliases":["GHSA-xv26-6w52-cph6"],"url":"https://o3.security/vulnerability/CVE-2026-54466","summary":"websocket-driver: Message corruption via abuse of protocol length headers","details":"### Impact\n\nThe frame format in draft versions of the WebSocket protocol includes a length header that allows an arbitrarily large integer to be encoded as a sequence of bytes with the high bit set. By sending an indefinite sequence of bytes with values `0x80` or above, a client can make the server parse these bytes into an ever-growing integer. Since JavaScript numbers are 64-bit floating point values, this number will eventually lose precision and lead to the subsequent payload being parsed incorrectly.\n\n### Patches\n\nThe issue has been patched in version 0.7.5 by rejecting the message if the length header exceeds the configured maximum message length. All users should upgrade to this version.\n\n### Workarounds\n\nNo known workarounds exist.\n\n### Acknowledgements\n\nThis issue was discovered and reported by Pranjali Thakur, DepthFirst Security Research Team.","published":"2026-07-17T20:53:24.769Z","modified":"2026-09-05T09:55:54.997459599Z","cvss":null,"epss":{"score":0.00221,"percentile":0.12787,"asOf":"2026-09-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"websocket-driver","fixedVersion":"0.7.5"}],"fix":{"url":"https://github.com/faye/websocket-driver-node/commit/5b197ca874dab58e96cacad8a3c256797d804680","label":"faye/websocket-driver-node@5b197ca"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54466.json"},{"type":"ADVISORY","url":"https://github.com/faye/websocket-driver-node/security/advisories/GHSA-xv26-6w52-cph6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54466"},{"type":"FIX","url":"https://github.com/faye/websocket-driver-node/commit/5b197ca874dab58e96cacad8a3c256797d804680"},{"type":"PACKAGE","url":"https://github.com/faye/websocket-driver-node"},{"type":"WEB","url":"https://github.com/faye/websocket-driver-node/releases/tag/0.7.5"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-05T09:55:54.997459599Z"}}