{"apiVersion":"1.0","identifier":"CVE-2026-53524","description":"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.","publishedAt":"2026-08-21T23:16:26","lastModifiedAt":"2026-08-24T20:16:47","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53524","cvssScore":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","epssProbability":0.00268,"riskScore":0.67,"affectedProduct":"WeeChat","affectedVersions":">=4.3.0,<4.9.1","vulnerabilityType":"Other","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-53524","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-53524","en":"https://www.redsauce.net/en/cves/CVE-2026-53524","fr":"https://www.redsauce.net/fr/cves/CVE-2026-53524","pt":"https://www.redsauce.net/pt/cves/CVE-2026-53524","de":"https://www.redsauce.net/de/cves/CVE-2026-53524","sk":"https://www.redsauce.net/sk/cves/CVE-2026-53524","el":"https://www.redsauce.net/el/cves/CVE-2026-53524"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-53524"}}