CVE-2026-55241

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Source
https://cve.org/CVERecord?id=CVE-2026-55241
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55241.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55241
Aliases
  • GHSA-9xvg-x28f-m78m
Published
2026-08-21T17:57:10Z
Modified
2026-09-20T11:30:38Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Checkmate: Pre-auth Denial of Service via File Upload on Registration
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-400",
        "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55241.json"
}
References

Affected packages

Git / github.com/bluewave-labs/checkmate

Affected ranges

Type
GIT
Repo
https://github.com/bluewave-labs/checkmate
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
091c36cbf338b673110b0806d76df26d52516468
Fixed
825bcc5fdbd0dbde9e78033ce844ab880a46083a
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.9.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

V3.*
V3.0-beta
Other
untagged-819f0fe0d99d8d0b5f14
v1.*
v1.0
v1.1.0
v2.*
v2.0.1
v2.0.2
v2.1
v2.1.1
v2.2
v2.3
v2.3.1
v3.*
v3.1
v3.1-beta
v3.1.1
v3.1.2
v3.1.3
v3.1.4
v3.1.5
v3.1.6
v3.1.7
v3.1.8
v3.2.0
v3.3
v3.4.0
v3.5.0
v3.5.1
v3.6.1
v3.7.1
v3.8.0
v3.8.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55241.json"