MAL-2026-11544

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/simple-date-formatter-util-10/MAL-2026-11544.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-11544
Published
2026-08-04T22:07:20Z
Modified
2026-08-04T23:05:29.859701019Z
Summary
Malicious code in simple-date-formatter-util-10 (npm)
Details

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

Source: amazon-inspector (b4fc695a31f735a6d7603ba7938ea65bb907620d8bee07dd8f93af372623c4df)

On npm install, package.json's postinstall hook launches a detached bash reverse shell over /dev/tcp to 124.221.154.135:4444, giving remote interactive control of the installer's host. A companion postinstall.js reads the installer's ~/.ssh directory listing along with os.userInfo() and platform data and POSTs the collected data over HTTPS to the same host 124.221.154.135. Both mechanisms fire automatically at install time with no user interaction and provide the operator persistent remote access plus credential-material reconnaissance.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-04T22:30:11.697558731Z",
            "sha256": "b4fc695a31f735a6d7603ba7938ea65bb907620d8bee07dd8f93af372623c4df",
            "modified_time": "2026-08-04T22:07:20Z",
            "id": "IN-MAL-2026-011339",
            "versions": [
                "1.0.0"
            ],
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / simple-date-formatter-util-10

Package

Name
simple-date-formatter-util-10
View open source insights on deps.dev
Purl
pkg:npm/simple-date-formatter-util-10

Affected ranges

Affected versions

1.*
1.0.0

Database specific

cwes 
[
    {
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature."
    }
]
indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-wZIQj9DJd4Ai4JWdOoDau6V3l4eO+CzL0jZjhikg6V+hql2o6/e8tu4QKqzNBswEj3OBQxMAlCha2dKgC9bdog==",
                "sha1": "3478849b3088f2cd75af4aa5aea8ec8f6e3f56a0"
            },
            "filename": "simple-date-formatter-util-10-1.0.0.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "package.json",
            "sha256": "b827102394b15ebbf4a2ac6a3009249f8028768166854b5551b330b2d1ba5384",
            "tlsh": "b6e0c600ca208c3327c886fd8a16c512bb05de1b00283c09b7df2208a38fe7380bcb0e"
        },
        {
            "path": "postinstall.js",
            "sha256": "f2be6940c08d36a7f1ce83d5fe16fefd8c14edda5d124e0f6406725beb5020ef",
            "tlsh": "273165d558f9cd3007778685639b91263102fe13650ee940f3c807a51fe9a5449f2dee"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/simple-date-formatter-util-10/MAL-2026-11544.json"