MAL-2026-14031

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/datefmt-core-utils/MAL-2026-14031.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-14031
Published
2026-08-14T14:12:26Z
Modified
2026-08-14T14:46:34.648209958Z
Summary
Malicious code in datefmt-core-utils (npm)
Details

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

Source: amazon-inspector (360a94a10ce13edded9e4a99c7c01de1ebfdd73a9af4ec49260f2cec165a609b)

The package advertises itself as a date-formatting utility but ships a postinstall.js that npm auto-executes on install via scripts.postinstall. postinstall.js opens a TCP connection to the hardcoded remote 8.135.48.40:4444 and wires /bin/bash stdio to that socket, giving the remote endpoint an interactive shell on the installer's machine. Three redundant methods are attempted (python3 pty.spawn, python3 subprocess, and Node net+child_process.spawn of '/bin/bash -i'). The index.js date-formatting code is a cover story unrelated to the postinstall payload.

Database specific 
{
    "malicious-packages-origins": [
        {
            "versions": [
                "1.0.0"
            ],
            "modified_time": "2026-08-14T14:12:26Z",
            "id": "IN-MAL-2026-017762",
            "sha256": "360a94a10ce13edded9e4a99c7c01de1ebfdd73a9af4ec49260f2cec165a609b",
            "source": "amazon-inspector",
            "import_time": "2026-08-14T14:28:07.005680843Z"
        }
    ]
}
References
Credits

Affected packages

npm / datefmt-core-utils

Package

Name
datefmt-core-utils
View open source insights on deps.dev
Purl
pkg:npm/datefmt-core-utils

Affected ranges

Affected versions

1.*
1.0.0

Database specific

indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-hvZBQRZyTceFZ71HT/apoUh7nfMLmAsxRdKem5iy21tQgadfzKhvQDARn26pDDaCF3ELL5nyg0WociATDLVg0w==",
                "sha1": "413867c05647bbb16037f2af15cc0c3427395341"
            },
            "filename": "datefmt-core-utils-1.0.0.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "postinstall.js",
            "tlsh": "f911edf553ebe238efba20b4786e906336a393032782dad8341e47019f535540c92ae1",
            "sha256": "26fcaa78b7a6707b39d80122863ca90e2e7d39302810c1c209f9a1e0f327cff3"
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/datefmt-core-utils/MAL-2026-14031.json"