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Chat message sending limit exploit makes Klei servers lag to a frame per minute or crash indefinitely


konijnenmoed
  • Pending

As stated previously on this bug report: 

 

A player connects to the server (doesn't pick a character and doesn't spawn in), and they lag the server to 1 frame per minute. If rejoining doesn't work or takes too long, the server will crash after around 10 minutes. Happened to multiple servers I played on.

On 5/14/2025 at 2:08 AM, niscento said:

This happened to me as well, and in the chat logs I found millions of empty lines sent by the lag maker, even though I have only stayed around for a minute. It looks like the chat message sending limit is only applied on clients, and that person has found a way to unlock it, most likely by tampering with the engine.

Added client chat log provided by @niscento.


Steps to Reproduce
  1. Join a Klei server
  2. Wait until lagger joins (without spawning in)
  3. Lagger sends millions of empty lines in chat
  4. Have the game freeze to 1 frame a minute
  5. Get disconnected
  6. Rejoin (see uploaded image)
  7. Get disconnected again
  8. Server crashes

Screenshot 2025-05-12 at 22.31.42.png

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  • Thanks 1



User Feedback


It happened again by Steam user Tabs (76561199835427864). Added chat logs provided by a player who was at Hound Huggles during crash today.

Note that this time players that crashed were not able to launch the game right away after crashing. They were not able to launch properly until force quitting and starting the game a few times and/or after 15 minutes of waiting to relaunch. 

Screenshot 2025-05-29 at 19.55.05.png

client_chat_log_2025-05-29-20-19-07.txt client_chat_log_2025-05-29-20-21-21.txt

Edited by konijnenmoed
  • Like 1

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Many exploiters are starting to use this bug. Dedicated servers probably shouldn't be played until this is fixed.

The client chat logs I viewed also point towards exploiters using empty chat lines to lag the server. 

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9 hours ago, SpelunkerSplat said:

Many exploiters are starting to use this bug. Dedicated servers probably shouldn't be played until this is fixed.

The client chat logs I viewed also point towards exploiters using empty chat lines to lag the server. 

Could you add those client chat logs here?

Would be much appreciated. If you can't find them in the regular Klei folder, you may find them in the back up folder. 

Edited by konijnenmoed

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