Denial of Service in WeeChat Relay Module by WeeChat Vendor
CVE-2026-53524

6.5MEDIUM

Key Information:

Vendor

Weechat

Status
Weechat
Vendor
CVE Published:
21 August 2026

What is CVE-2026-53524?

A vulnerability in the WeeChat relay module allows an authenticated relay user to exploit the permessage-deflate decompression function, relay_websocket_inflate(). It lacks an upper limit on output size, enabling the user to send a small compressed WebSocket frame that unpacks into enormous data sizes. This can lead to memory exhaustion of the server, potentially crashing the entire WeeChat process. The issue has been patched in version 4.9.1.

Affected Version(s)

weechat >= 4.3.0, < 4.9.1

References

https://github.com/weechat/weechat/security/advisories/GH...
x_refsource_CONFIRM

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.