Sourced from ws's releases.

7.4.6

Bug fixes

• Fixed a ReDoS vulnerability (00c425ec).

A specially crafted value of the Sec-Websocket-Protocol header could be used to significantly slow down a ws server.

for (const length of [1000, 2000, 4000, 8000, 16000, 32000]) {
  const value = 'b' + ' '.repeat(length) + 'x';
  const start = process.hrtime.bigint();
value.trim().split(/ *, */);
const end = process.hrtime.bigint();
console.log('length = %d, time = %f ns', length, end - start);
}

The vulnerability was responsibly disclosed along with a fix in private by Robert McLaughlin from University of California, Santa Barbara.

In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the --max-http-header-size=size and/or the maxHeaderSize options.

7.4.5

Bug fixes

• UTF-8 validation is now done even if utf-8-validate is not installed (23ba6b29).
• Fixed an edge case where websocket.close() and websocket.terminate() did not close the connection (67e25ff5).

7.4.4

Bug fixes

• Fixed a bug that could cause the process to crash when using the permessage-deflate extension (92774377).

7.4.3

Bug fixes

• The deflate/inflate stream is now reset instead of reinitialized when context takeover is disabled (#1840).

7.4.2

Bug fixes

... (truncated)

• f5297f7 [dist] 7.4.6
• 00c425e [security] Fix ReDoS vulnerability
• 990306d [lint] Fix prettier error
• 32e3a84 [security] Remove reference to Node Security Project
• 8c914d1 [minor] Fix nits
• fc7e27d [ci] Test on node 16
• 587c201 [ci] Do not test on node 15
• f672710 [dist] 7.4.5
• 67e25ff [fix] Fix case where abortHandshake() does not close the connection
• 23ba6b2 [fix] Make UTF-8 validation work even if utf-8-validate is not installed
• Additional commits viewable in compare view

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