Improper Handling of Highly Compressed Data (Data Amplification) Affecting weechat package, versions <4.9.3-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN14-WEECHAT-18956095
- published19 Aug 2026
- disclosed21 Aug 2026
Introduced: 19 Aug 2026
CVE-2026-53524 (opens in a new tab)How to fix?
Upgrade Debian:14 weechat to version 4.9.3-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream weechat package and not the weechat package as distributed by Debian.
See How to fix? for Debian:14 relevant fixed versions and status.
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.