VDB
CVE-2026-53524
CVE-2026-53524
PUBLISHED
CVSS 6.5 MEDIUM
Reported by GitHub_M · Published August 21, 2026
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.
Risk Scores
CVSS 3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| weechat | weechat | >= 4.3.0, < 4.9.1 |
| weechat | weechat | >= 4.3.0, < 4.9.1 |
Timeline
- Aug 9, 2026 CVE Published
References
- https://github.com/weechat/weechat/security/advisories/GHSA-v2v4-45wm-5cr3 x_refsource_CONFIRM