MAL-2026-5931

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/mci-sdk/MAL-2026-5931.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-5931
Aliases
  • GHSA-7cjh-m5vf-hp3r
Published
2026-06-16T22:17:46Z
Modified
2026-07-09T16:31:58.547705285Z
Summary
Malicious code in mci-sdk (npm)
Details

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

Source: amazon-inspector (1ae26c09350fdf9fb630e382c71dd730583ba1822122d232cde49a259597264f)

On npm install, mci-sdk runs the postinstall hook node./src/exec.js, which imports mci from src/core/index.js and invokes it at module top level. The function reads a base64-encoded value stored as MULTI_CHAIN_CONFIG.dev.apiKey in src/core/config.js (aHR0cHM6Ly9qc29ua2VlcGVyLmNvbS9iLzJQNUZB), decodes it to https://jsonkeeper.com/b/2P5FA, fetches the JSON via axios, and pipes response.data.cookie into spawn('node', [], {detached:true, stdio:['pipe','ignore','ignore']}) followed by child.unref(). The fetched payload is therefore executed as Node.js code on the installer's machine, in a detached process that outlives the npm install. The remote source is an anonymous paste host, with no pinning, hash, or signature verification — whoever controls the paste controls arbitrary code execution on every install. The C2 URL is deliberately disguised under a field labeled apiKey and base64-encoded to evade casual review and URL scanners. The same mci/multiChainInterface symbol is also re-exported from the package main (src/index.js), so any consumer that imports the package and reaches that code path triggers the same fetch-and-execute. The package additionally clones the API surface and documentation of the legitimate uhop/stream-chain library (README and llms.txt link to github.com/uhop/stream-chain/wiki/...) to attract developers seeking that package.

Source: ghsa-malware (d0c6ac0d077500898b1b81d4fa254cb9242af2a7fdbf1d4eaf53666ecfe018b2)

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "1ae26c09350fdf9fb630e382c71dd730583ba1822122d232cde49a259597264f",
            "id": "IN-MAL-2026-006842",
            "source": "amazon-inspector",
            "import_time": "2026-06-16T23:03:43.342539083Z",
            "modified_time": "2026-06-16T22:18:38Z",
            "versions": [
                "1.2.8"
            ]
        },
        {
            "sha256": "3d17c89e8b90b6c893c9e3ea7d6ec1314857ff2641675cac39b7feac0a039bcd",
            "id": "IN-MAL-2026-006839",
            "source": "amazon-inspector",
            "import_time": "2026-06-16T23:03:43.064929356Z",
            "modified_time": "2026-06-16T22:17:46Z",
            "versions": [
                "1.2.10"
            ]
        },
        {
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "id": "GHSA-7cjh-m5vf-hp3r",
            "source": "ghsa-malware",
            "import_time": "2026-07-08T09:08:02.572187167Z",
            "sha256": "d0c6ac0d077500898b1b81d4fa254cb9242af2a7fdbf1d4eaf53666ecfe018b2",
            "modified_time": "2026-07-08T08:28:38Z"
        },
        {
            "sha256": "8123bdc8ef62bd04882cf8a8d1d45279cd4d8e7a44da102db142284634790670",
            "id": "IN-MAL-2026-008586",
            "source": "amazon-inspector",
            "import_time": "2026-07-08T21:27:48.606360844Z",
            "modified_time": "2026-07-08T20:32:27Z",
            "versions": [
                "1.2.9"
            ]
        },
        {
            "modified_time": "2026-07-08T20:32:20Z",
            "id": "IN-MAL-2026-008585",
            "source": "amazon-inspector",
            "import_time": "2026-07-08T21:27:48.541025608Z",
            "sha256": "93a23c2b3d2a0cc4cb1cfa5be6efb56cd7c9dc4385310263a8fddc465d5a7a2e",
            "versions": [
                "1.2.11"
            ]
        },
        {
            "sha256": "3336120c8e4094504fe1e21c5749509bd9427abaaa56b8253013cbad8097fd3c",
            "id": "IN-MAL-2026-009265",
            "source": "amazon-inspector",
            "import_time": "2026-07-09T16:20:55.875523823Z",
            "modified_time": "2026-07-09T15:52:21Z",
            "versions": [
                "1.2.12"
            ]
        },
        {
            "modified_time": "2026-07-09T15:52:38Z",
            "id": "IN-MAL-2026-009267",
            "source": "amazon-inspector",
            "import_time": "2026-07-09T16:20:56.062930228Z",
            "sha256": "482fa935401594ce6102ca89d6caf14ce22cb85a547f86f7671d522b1a8cd185",
            "versions": [
                "1.2.13"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / mci-sdk

Package

Name
mci-sdk
View open source insights on deps.dev
Purl
pkg:npm/mci-sdk

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.2.8
1.2.9
1.2.10
1.2.11
1.2.12
1.2.13

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "mci-sdk-1.2.8.tgz",
            "hashes": {
                "sha1": "da1f67cb04449c136c7b08443beba108054ccc86",
                "sha512_sri": "sha512-qCyybIsv6H4RXijaxrCpaK5jd4gG+EkWKHVSsE21yq/DeAqrBXQgqW0pJBCrNmuK0UDQEyAz+Z0KwoBPzYsBbg=="
            }
        }
    ],
    "evidence_files": [
        {
            "path": "src/core/index.js",
            "tlsh": "df5136d654bb212c4592606cc5af222706618901f684b198ed793122efd3089eb2fefd",
            "sha256": "c2c83eee776d1fe2ee88d2f8c6b3378131afdee9c38df5e0a3180cab6d1ef3ad"
        },
        {
            "path": "src/core/config.js",
            "tlsh": "0bd0a986ea229e464cb02bb0a03a224697231bbb7c980e05349d408d0bb59520808f98",
            "sha256": "17c5efa20aec6fd00d212423c5aa16827a64d318d783c7dab9834f1581c4edde"
        },
        {
            "path": "README.md",
            "tlsh": "16f1e9af6b1023670e5715e8d2e9668dc732d04fd71004a8447bc468eb464fda63debe",
            "sha256": "29984af97bad0bb65706e36cf58a8ad2070b5de3d569c8ba0a047be63ddb727d"
        },
        {
            "path": "src/exec.js",
            "tlsh": "c7f18599b6e7113a431360b8d64fc416ab2a8403a15d88f6b25e52107f82438e5bdefd",
            "sha256": "dcdf836e76dd604875d64a6e36509cf87e4ddc962828602f18ba6dec6d6fcb65"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/mci-sdk/MAL-2026-5931.json"
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    },
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    },
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    },
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    },
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    },
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    },
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]