High 7.5Published Aug 21, 2026

CVE-2026-55241Checkmate: Pre-auth Denial of Service via File Upload on Registration

Updated under an hour ago (2026-10-19 06:25 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for bluewave-labs Checkmate

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400, CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

bluewave-labs Checkmate bluewave_labs:checkmate (from the name)	before 3.9.1	CNA record

References

https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-9xvg-x28f-m78mx-refsource-confirm
https://github.com/bluewave-labs/Checkmate/commit/091c36cbf338b673110b0806d76df26d52516468x-refsource-misc
https://github.com/bluewave-labs/Checkmate/releases/tag/v3.9.1x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.