Bug 2521246 (CVE-2026-53524) - CVE-2026-53524 weechat: WeeChat: Denial of Service via WebSocket decompression bomb
Summary: CVE-2026-53524 weechat: WeeChat: Denial of Service via WebSocket decompressio...
Keywords:
Status: NEW
Alias: CVE-2026-53524
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2521989 2523271 2521990
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-21 22:31 UTC by OSIDB Bzimport
Modified: 2026-08-25 08:33 UTC (History)
0 users

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Description OSIDB Bzimport 2026-08-21 22:31:20 UTC 
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.
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