{"id":"DEBIAN-CVE-2026-53524","details":"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.","modified":"2026-09-10T08:47:26.525046190Z","published":"2026-08-21T23:16:26.213Z","upstream":["CVE-2026-53524"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-53524"}],"affected":[{"package":{"name":"weechat","ecosystem":"Debian:12","purl":"pkg:deb/debian/weechat?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.8-1","4.0.1-1","4.0.2-1","4.0.5-1","4.1.1-1","4.10.0-1","4.3.1-1","4.4.2-1","4.4.3-1","4.4.3-1~bpo12+1","4.5.1-1","4.6.1-1","4.6.3-1","4.6.3-1~bpo12+1","4.7.2-1","4.8.1-1","4.9.0-1","4.9.3-1","4.9.4-1","4.9.5-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53524.json"}},{"package":{"name":"weechat","ecosystem":"Debian:13","purl":"pkg:deb/debian/weechat?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.10.0-1","4.6.3-1","4.7.2-1","4.8.1-1","4.9.0-1","4.9.3-1","4.9.4-1","4.9.5-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53524.json"}},{"package":{"name":"weechat","ecosystem":"Debian:14","purl":"pkg:deb/debian/weechat?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.9.3-1"}]}],"versions":["4.6.3-1","4.7.2-1","4.8.1-1","4.9.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53524.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}