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CVE-2026-55241

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.

Published Aug 21, 2026CWE-400EPSS 0.62%

Overview

CVE-2026-55241 is a high-severity vulnerability. It was published on August 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/bluewave-labs/Checkmate/commit/091c36cbf338b673110b0806d76df26d52516468GitHubgithub.com/bluewave-labs/Checkmate/releases/tag/v3.9.1GitHubgithub.com/bluewave-labs/Checkmate/security/advisories/GHSA-9xvg-x28f-m78mGitHubgithub.com/bluewave-labs/Checkmate/security/advisories/GHSA-9xvg-x28f-m78m

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55241?

CVE-2026-55241 is a high-severity vulnerability. It was published on August 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-55241?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-55241?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55241?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55241 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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