SEPTEMBER 19, 2026
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Case File

CVE-2026-55241

HIGH · CVSS 7.5 EPSS 0.44% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-21 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

The Checkmate tool is vulnerable to a denial-of-service attack due to improper handling of multipart file uploads in the registration process, allowing unauthenticated attackers to submit oversized files that can exhaust server memory. This can lead to backend crashes or instability, impacting the availability of the service. Organizations using versions prior to 3.9.1 should prioritize upgrading to mitigate this high-severity risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-55241
Severity
HIGH
CVSS
7.5
EPSS
0.44%

Original NVD 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.