Microsoft Security Response Center 日本語 フォロー CVE-2026-15711 Libsoup: soupwebsocketconnection: libsoup: websocket リモートサービス拒否 (oversized control frame protocol violation) CVE-2026-15711 Libsoup: soupwebsocketconnection: libsoup: websocket remote denial of service via oversized control frame protocol violation msrc.microsoft.com
