CVE-2026-53524 | BDVDB-2026-363382 Detail

Description#

WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 4.3.0 through 4.9.0, the WeeChat relay module's WebSocket permessage-deflate decompression function relay_websocket_inflate() has no upper bound on output size. An authenticated relay user can send a small compressed WebSocket frame (~100 bytes) that decompresses to gigabytes, exhausting all server memory and crashing the entire WeeChat process. The api protocol enables permessage-deflate and requires authentication before WebSocket upgrade. Version 4.9.1 patches the issue.

Impact#

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Exploit#

History#

1. Version 12026-08-21Record published in the CVE List.
2. Version 22026-08-24Most recent update recorded in the CVE List.