MAL-2026-5647

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/ts-ecro/MAL-2026-5647.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-5647
Published
2026-06-11T13:19:22Z
Modified
2026-06-11T13:46:35.755686706Z
Summary
Malicious code in ts-ecro (npm)
Details

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

Source: amazon-inspector (37901692194f47c987610aab18ef37d4361e8ab01efd1a8008876920dd8b8aa2)

Package is published as 'ts-ecro' but ships a verbatim copy of big.js v7.0.1 with the original author's copyright, email, and GitHub repository URL — a typosquat/impersonation façade for the upstream big.js library. At module top-level, the entrypoint require()s a sibling attacker-controlled package and immediately invokes its fromstr() method, executing arbitrary code from that dependency on every import. The CommonJS variant (big.js:606-608) loads 'websocket-slot' and calls doc.fromstr().then(...).catch(...); the ESM variant (big.mjs:606-608) wraps require("parket-slot") + doc.from_str() in a try/catch that swallows errors so the import appears clean. package.json declares 'parket-slot': '^0.0.6' as a runtime dependency, ensuring the loader executes on a default install. The genuine big.js library has no such require call — the loader is appended on top of an otherwise-legitimate codebase to disguise the attack. Any project that installs and imports this package automatically runs whatever code parket-slot / websocket-slot ships, with attacker control over those packages' contents.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-005741",
            "versions": [
                "0.0.5"
            ],
            "sha256": "37901692194f47c987610aab18ef37d4361e8ab01efd1a8008876920dd8b8aa2",
            "source": "amazon-inspector",
            "modified_time": "2026-06-11T13:19:22Z",
            "import_time": "2026-06-11T13:27:21.151877739Z"
        },
        {
            "id": "IN-MAL-2026-005744",
            "versions": [
                "0.0.6"
            ],
            "sha256": "6c0bc0efa5cfcc82b1f5b92bdbe69263b1da4cd9430a12c3e115e32002deda7e",
            "source": "amazon-inspector",
            "modified_time": "2026-06-11T13:19:25Z",
            "import_time": "2026-06-11T13:27:21.274204488Z"
        },
        {
            "id": "IN-MAL-2026-005743",
            "import_time": "2026-06-11T13:27:21.219174567Z",
            "sha256": "8f2e942dcd86b8cef2bd0eb8809553bdd339bfc9c30b23ed3908df264a28fac0",
            "source": "amazon-inspector",
            "modified_time": "2026-06-11T13:19:25Z",
            "versions": [
                "0.0.6"
            ]
        },
        {
            "id": "IN-MAL-2026-005742",
            "versions": [
                "0.0.5"
            ],
            "sha256": "f7dba297ddf69a33859e42330e69aefaba884b2893aae47b98d531129c45d212",
            "source": "amazon-inspector",
            "modified_time": "2026-06-11T13:19:23Z",
            "import_time": "2026-06-11T13:27:21.190505859Z"
        }
    ]
}
References
Credits

Affected packages

npm / ts-ecro

Package

Name
ts-ecro
View open source insights on deps.dev
Purl
pkg:npm/ts-ecro

Affected ranges

Affected versions

0.*
0.0.5
0.0.6

Database specific

cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506"
    },
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "big.mjs",
            "sha256": "cc4f38d2c43eae53227a80cb79358fe6373f067d82d5b4b9e1cc135a0fbfbcc3",
            "tlsh": "50c2658c3ac67579593363788f4a5088eb38525712c8b186b4ae63b46f78cb107b5fdc"
        },
        {
            "path": "package.json",
            "sha256": "defd0c08e5add03737a0d979034cb5509b86c8a94313789f913f6ab1e66770fb",
            "tlsh": "93210163c9a19da70af85ba4bc6c03aaf1161b2f40a05c5bb07b131c4b3345b2095bbd"
        }
    ],
    "package_integrity": [
        {
            "filename": "ts-ecro-0.0.5.tgz",
            "hashes": {
                "sha512_sri": "sha512-eVds3vphhGSNiX2T/VtfC+3BaNyes449zUK8RP/oJhl9k9xsBGUo+2j1KuevHsvqSLPmrLvMewDGmVenK5tkjA==",
                "sha1": "617c8e5af9e25937b83a08c10eb962f6701814f2"
            }
        }
    ],
    "domains": [
        "datasecure-service.vercel.app"
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/ts-ecro/MAL-2026-5647.json"