Resource exhaustion in Bluewave-Labs Checkmate
CVE-2026-55241
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Bluewave-Labs Checkmate — versions < 3.9.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-55241?
- CVE-2026-55241 is a high-severity vulnerability in Bluewave-Labs Checkmate, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-08-21.
- How severe is CVE-2026-55241?
- High severity. CVSS v3 base score is 7.5 out of 10.