Security advisory

{
  "id": "e70faab0bec90a707f925ba5e4a29855999265bb26007ff27de66710f9675565",
  "url": "https://osv.dev/vulnerability/CVE-2026-43678",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-43678",
    "summary": "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.",
    "evidence": "osv:CVE-2026-43678",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-43678",
      "aliases": [
        "CVE-2026-43678",
        "GHSA-qcc5-f287-vgmq"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apple/swift-nio",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "77b84ac2cd2ac9e4ac67d19f045fd5b434f56967"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apple:swiftnio:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "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"
          }
        }
      ],
      "modified": "2026-10-24T02:30:42.157990124Z",
      "provider": "osv",
      "references": [
        "https://github.com/apple/swift-nio/security/advisories/GHSA-qcc5-f287-vgmq"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2026-43678",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 428155,
  "published_at": "2026-08-20T19:16:52.353+00:00"
}