Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/bluewave-labs/Checkmate/commit/091c36cbf338b673110b0806d76df2
- https://github.com/bluewave-labs/Checkmate/releases/tag/v3.9.1
- https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-9xvg-x28f-m7
FAQ
What is CVE-2026-55241?
CVE-2026-55241 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 publi...
How severe is CVE-2026-55241?
CVE-2026-55241 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55241?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.