MEDIUM 6.5 NVD

CVE-2026-53524

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 deco

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.

References

https://github.com/weechat/weechat/security/advisories/GHSA-v2v4-45wm-5cr3

Published: 2026-08-21 · Source: NVD · Feed updated: 2026-08-22

This medium severity vulnerability with a CVSS score of 6.5 was published on 2026-08-21 via NVD.

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