CVE-2026-53524
Fixed in a distro release EPSS <1%CVSS 6.5
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.
Products: weechat
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | weechat | no fix |
| Debian 13 | weechat | no fix |
| Debian 14 | weechat | 4.9.3-1 |
| Ubuntu 22.04 LTS | weechat | no fix |
| Ubuntu 24.04 LTS | weechat | no fix |
| Ubuntu 26.04 LTS | weechat | no fix |
| Ubuntu Pro 16.04 LTS | weechat | no fix |
| Ubuntu Pro 18.04 LTS | weechat | no fix |
| Ubuntu Pro 20.04 LTS | weechat | no fix |
| openSUSE Leap 16.0 | weechat | 4.10.0-bp160.1.1 |
| openSUSE Tumbleweed | weechat | 4.10.0-1.1 |