Improper Handling of Length Parameter Inconsistency Affecting websocket-driver package, versions <0.7.5
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-WEBSOCKETDRIVER-17987994
- published16 Jul 2026
- disclosed15 Jul 2026
- creditpranjalithakur
Introduced: 15 Jul 2026
NewCVE-2026-54466 (opens in a new tab)How to fix?
Upgrade websocket-driver to version 0.7.5 or higher.
Overview
websocket-driver is a websocket protocol handler with pluggable I/O.
Affected versions of this package are vulnerable to Improper Handling of Length Parameter Inconsistency through the hybi.js WebSocket frame processing in lib/websocket/driver. An attacker can corrupt how the server parses a message by sending a draft WebSocket frame with a length header made of an indefinite run of bytes with the high bit set, causing the parsed length to grow past the configured maximum. As the parser accumulates that oversized length into a JavaScript number, precision is lost and the following payload is decoded incorrectly, breaking message handling on the server and delivering malformed data to the application.