CVE-2026-54466 – websocket-driver: Message corruption via abuse of protocol length headers

CVE ID :CVE-2026-54466

Published : July 17, 2026, 9:17 p.m. | 21 minutes ago

Description :websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.7.5, the 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 in lib/websocket/driver/draft75.js; because JavaScript numbers are 64-bit floating point values, this number will eventually lose precision and lead to the subsequent payload being parsed incorrectly. This issue is fixed in version 0.7.5.

Severity: 9.2 | CRITICAL

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