{"id":"CVE-2026-43678","details":"An unauthenticated remote peer can crash any NIOWebSocket-based server (including Vapor and Hummingbird) with a single 11-byte frame sent after a completed WebSocket handshake, dropping all active connections until the process restarts. This vulnerability is addressed in swift-nio version 2.101.0.","aliases":["GHSA-qcc5-f287-vgmq"],"modified":"2026-08-30T08:17:18.243335Z","published":"2026-08-20T19:16:52.353Z","references":[{"type":"ADVISORY","url":"https://github.com/apple/swift-nio/security/advisories/GHSA-qcc5-f287-vgmq"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apple/swift-nio","events":[{"introduced":"0"},{"fixed":"77b84ac2cd2ac9e4ac67d19f045fd5b434f56967"}],"database_specific":{"cpe":"cpe:2.3:a:apple:swiftnio:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"2.101.0"}],"source":"CPE_RANGE"}}],"versions":["2.100.0","2.99.0","2.98.0","2.97.1","2.97.0","2.96.0","2.95.0","2.94.1","2.94.0","2.93.0","2.92.2","2.92.1","2.92.0","2.91.0","2.90.1","2.90.0","2.89.0","2.88.0","2.87.0","2.86.2","2.86.1","2.86.0","2.85.0","2.84.0","2.83.0","2.82.1","2.82.0","2.81.0","2.80.0","2.79.0","2.78.0","2.76.1","2.76.0","2.75.0","2.74.0","2.73.0","2.72.0","2.71.0","2.70.0","2.69.0","2.68.0","2.67.0","2.66.0","2.65.0","2.64.0","2.63.0","2.62.0","2.61.1","2.61.0","2.60.0","2.59.0","2.58.0","2.57.0","2.56.0","2.55.0","2.54.0","2.53.0","2.52.0","2.51.1","2.51.0","2.50.0","2.49.0","2.48.0","2.47.0","2.46.0","2.45.0","2.44.0","2.42.0","2.43.1","2.43.0","2.29.0","2.39.0","2.41.1","2.41.0","2.40.0","2.38.0","2.37.0","2.36.0","2.35.0","2.34.0","2.33.0","2.32.3","2.32.2","2.32.1","2.32.0","2.31.0","2.30.0","2.28.0","2.27.0","2.26.0","2.25.1","2.25.0","2.24.0","2.23.0","2.22.1","2.22.0","2.21.0","2.20.2","2.20.1","2.20.0","2.19.0","2.18.0","2.17.0","2.16.0","2.15.0","2.14.0","2.13.0","2.12.0","2.11.1","2.11.0","2.10.1","2.10.0","2.9.0","2.8.0","2.7.1","2.7.0","2.6.1","2.6.0","2.5.1","2.5.0","2.4.0","2.3.0","2.2.0","2.1.0","2.0.0","2.0.0-convergence.4","2.0.0-convergence.3","2.0.0-convergence.2","2.0.0-convergence.1","1.12.0","1.11.0","1.10.0","1.9.0","1.6.1","1.7.2","1.4.2","1.5.1","1.2.1","1.3.1","1.0.0","1.1.0","1.8.0","1.7.1","1.7.0","1.6.0","1.5.0","1.4.1","1.4.0","1.3.0","1.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43678.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}