CVE-2026-55241 - Checkmate: Pre-auth Denial of Service via File Upload on Registration
Brief
CVE ID : CVE-2026-55241
Published : Aug. 21, 2026, 6:16 p. m.
- 53 minutes ago
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.
- 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.
- 1.
Severity: 7.5
- HIGH