{"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":"2026-08-25T11:51:15.776Z"},"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"}},"adp":[{"references":[{"url":"https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-9xvg-x28f-m78m","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T11:47:48.710908Z","id":"CVE-2026-55241","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-25T11:51:15.776Z"}}]}}