{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55241",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-16T16:44:00.624Z",
        "datePublished": "2026-08-21T17:57:10.014Z",
        "dateUpdated": "2026-08-21T17:57:10.014Z"
    },
    "containers": {
        "cna": {
            "title": "Checkmate: Pre-auth Denial of Service via File Upload on Registration",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-400",
                            "lang": "en",
                            "description": "CWE-400: Uncontrolled Resource Consumption",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-770",
                            "lang": "en",
                            "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-9xvg-x28f-m78m",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-9xvg-x28f-m78m"
                },
                {
                    "name": "https://github.com/bluewave-labs/Checkmate/commit/091c36cbf338b673110b0806d76df26d52516468",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/bluewave-labs/Checkmate/commit/091c36cbf338b673110b0806d76df26d52516468"
                },
                {
                    "name": "https://github.com/bluewave-labs/Checkmate/releases/tag/v3.9.1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/bluewave-labs/Checkmate/releases/tag/v3.9.1"
                }
            ],
            "affected": [
                {
                    "vendor": "bluewave-labs",
                    "product": "Checkmate",
                    "versions": [
                        {
                            "version": "< 3.9.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-21T17:57:10.014Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "source": {
                "advisory": "GHSA-9xvg-x28f-m78m",
                "discovery": "UNKNOWN"
            }
        }
    }
}