Feed/CVE-2026-54466
CVE-2026-54466HIGHCVSS 7.5

websocket-driver: Message corruption via abuse of protocol length headers

Published Jul 15, 2026·Updated Aug 6, 2026

NVD Description

### Impact 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. Since JavaScript numbers are 64-bit floating point values, this number will eventually lose precision and lead to the subsequent payload being parsed incorrectly. ### Patches The 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. ### Workarounds No known workarounds exist. ### Acknowledgements This issue was discovered and reported by Pranjali Thakur, DepthFirst Security Research Team.

Affected Packages (1)

websocket-driverNPM
Fixed in 0.7.5

References

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