{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.9.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "091c36cbf338b673110b0806d76df26d52516468"
            },
            {
              "fixed": "825bcc5fdbd0dbde9e78033ce844ab880a46083a"
            }
          ],
          "repo": "https://github.com/bluewave-labs/checkmate",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9xvg-x28f-m78m"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55241.json"
  },
  "details": "Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. Prior to 3.9.1, the public POST /api/v1/auth/register route in server/src/api/routes/authRoutes.ts passes multipart profileImage uploads through in-memory Multer parsing before registration validation, without file-size, file-count, or MIME-type limits in server/src/api/middleware/upload.ts. An unauthenticated attacker can submit concurrent oversized files that are buffered before invalid registration or invite-token checks reject the request, exhausting memory and crashing or destabilizing the backend. This issue is fixed in version 3.9.1.",
  "id": "CVE-2026-55241",
  "modified": "2026-09-20T11:30:38.879294832Z",
  "published": "2026-08-21T17:57:10.014Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/bluewave-labs/Checkmate/releases/tag/v3.9.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55241.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-9xvg-x28f-m78m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55241"
    },
    {
      "type": "FIX",
      "url": "https://github.com/bluewave-labs/Checkmate/commit/091c36cbf338b673110b0806d76df26d52516468"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Checkmate: Pre-auth Denial of Service via File Upload on Registration"
}