{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.25.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9fec95f4386404cd311c9a445065513871ad9aa8"
            },
            {
              "fixed": "215d81eb700d5419c3396a0fbf23f2e246dfac2d"
            }
          ],
          "repo": "https://github.com/signalk/signalk-server",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-vmfm-ch9h-5c7g"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-307"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41893.json"
  },
  "details": "Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.25.0, the HTTP login endpoints (POST /login and POST /signalk/v1/auth/login) are protected by express-rate-limit (default: 100 attempts per 10-minute window, configurable via HTTP_RATE_LIMITS). The WebSocket login path — sending {login: {username, password}} messages over an established WebSocket connection — calls app.securityStrategy.login() directly without any rate limiting. An attacker can bypass HTTP rate limiting entirely by opening a WebSocket connection and attempting unlimited password guesses at the speed bcrypt allows (~20 attempts/sec with 10 salt rounds). This issue has been patched in version 2.25.0.",
  "id": "CVE-2026-41893",
  "modified": "2026-07-15T01:49:15.676051643Z",
  "published": "2026-05-09T19:12:10.082Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/SignalK/signalk-server/releases/tag/v2.25.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41893.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41893"
    },
    {
      "type": "FIX",
      "url": "https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d"
    },
    {
      "type": "FIX",
      "url": "https://github.com/SignalK/signalk-server/pull/2568"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force)"
}