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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
bluewave-labs:checkmate
References 3
https://github.com/bluewave-labs/Checkmate/commit/091c36cbf338b673110b0806d76df…
security-advisories@github.com
https://github.com/bluewave-labs/Checkmate/releases/tag/v3.9.1
security-advisories@github.com
https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-9xvg-x28f-m…
security-advisories@github.com