CVE-2026-53524
WeeChat has a Decompression Bomb in Relay WebSocket (DoS)
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.
INFO
Published Date :
Aug. 21, 2026, 10:18 p.m.
Last Modified :
Aug. 21, 2026, 10:18 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-53524
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update WeeChat to version 4.9.1 or later.
- Ensure relay module is configured securely.
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CVE-2026-53524 vulnerability anywhere in the article.