This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-53524 →

DEBIAN-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-de...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 weechat

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 weechat

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 weechat

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.9.3-1"}]}]

References

advisory security-tracker.debian.org