{"apiVersion":"1.0","identifier":"CVE-2026-55241","description":"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.","publishedAt":"2026-08-21T18:16:48","lastModifiedAt":"2026-08-25T12:16:24","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55241","cvssScore":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","epssProbability":0.00438,"riskScore":0.78,"affectedProduct":"Checkmate","affectedVersions":"<3.9.1","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-55241","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-55241","en":"https://www.redsauce.net/en/cves/CVE-2026-55241","fr":"https://www.redsauce.net/fr/cves/CVE-2026-55241","pt":"https://www.redsauce.net/pt/cves/CVE-2026-55241","de":"https://www.redsauce.net/de/cves/CVE-2026-55241","sk":"https://www.redsauce.net/sk/cves/CVE-2026-55241","el":"https://www.redsauce.net/el/cves/CVE-2026-55241"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-55241"}}