MAL-2026-6294

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/cue-mcp/MAL-2026-6294.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6294
Published
2026-06-23T14:10:26Z
Modified
2026-06-23T14:31:19Z
Summary
Malicious code in cue-mcp (npm)
Details

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (5dce71f7cd453bd73a138279dd78ebc607d7c4f6b171bd3b76c7f456a6eb907a)

The package's postinstall.js script runs automatically on npm install and collects host identifying data (os.hostname()) along with process environment variables (process.env), then transmits the data over HTTPS. This shape — system-information harvesting at install time and outbound network transmission via the https module — is a classic install-time exfiltration pattern. There is no legitimate purpose served by reading the installer's environment variables and hostname during postinstall for a package of this kind. Environment variables on developer and CI machines routinely contain credentials (NPM_TOKEN, GITHUB_TOKEN, AWS keys, CI secrets), so this beacon constitutes credential exfiltration risk against any system that installs the package.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-007199",
            "import_time":  "2026-06-23T14:23:02.623475392Z",
            "modified_time":  "2026-06-23T14:10:26Z",
            "sha256":  "5dce71f7cd453bd73a138279dd78ebc607d7c4f6b171bd3b76c7f456a6eb907a",
            "source":  "amazon-inspector",
            "versions":  [
                "9999.99.99"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / cue-mcp

Package

Name
cue-mcp
View open source insights on deps.dev
Purl
pkg:npm/cue-mcp

Affected ranges

Affected versions

9999.*
9999.99.99

Database specific

cwes 
[
    {
        "cweId":  "CWE-506",
        "description":  "The product contains code that appears to be malicious in nature.",
        "name":  "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files":  [
        {
            "path":  "postinstall.js",
            "sha256":  "c92690a6cce612b551d38a96579679de4391e2815d486dcb146d2c2257db6ead",
            "tlsh":  "7951d6664a98d2350ba226edf843d4235dbbd05637d698f0b70d52622fc51ac0272bdf"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "cue-mcp-9999.99.99.tgz",
            "hashes":  {
                "sha1":  "fc918fa13c4975f4f4408d7230cd921166029645",
                "sha512_sri":  "sha512-Y5alvnqilj5ZSJXw3qlS8IsxaZRlwPWnLPJvLpADsDvtngpup75hOMUoLmsj134HbqIMb18lL409vQBtS+2F5w=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/cue-mcp/MAL-2026-6294.json"