CVE-2026-55241: Bluewave-Labs Checkmate

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Bluewave-Labs Checkmate: before 3.9.1 (fixed in 3.9.1)

Published 2026-08-21. Last modified 2026-09-18.