MAL-2026-15551

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/date-fns-sync/MAL-2026-15551.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-15551
Published
2026-08-29T02:13:57Z
Modified
2026-08-29T02:30:12Z
Summary
Malicious code in date-fns-sync (npm)
Details

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

Source: amazon-inspector (8de9cc36a8817e94d67a46762e62e00a58e17077691ea1b4f649bc1f0d49e967)

package.json declares scripts.postinstall = 'node index.js'. index.js reconstructs a URL from a String.fromCharCode integer array — decoding to https://kongregate-api-config.vercel.app/ — fetches JSON from that endpoint, and passes the returned 'token' field directly to eval(). This executes attacker-controlled JavaScript on the installer's machine at npm install time. The destination is not a package publisher domain, the fetched payload is opaque and mutable, and the URL is deliberately concealed via char-code assembly to evade static analysis. The package's README describes it as a caching module, which does not match the observed behavior.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-019140",
            "import_time": "2026-08-29T02:22:21.00751341Z",
            "modified_time": "2026-08-29T02:13:57Z",
            "sha256": "8de9cc36a8817e94d67a46762e62e00a58e17077691ea1b4f649bc1f0d49e967",
            "source": "amazon-inspector",
            "versions": [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / date-fns-sync

Package

Name
date-fns-sync
View open source insights on deps.dev
Purl
pkg:npm/date-fns-sync

Affected ranges

Affected versions

1.*
1.0.0

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": "index.js",
            "sha256": "073bdcb28a0c84a5727ffd17a000839641c6d64dcf2fb640ff83dba4ff6a130d",
            "tlsh": "e0f0e25408bc8835022ff4bb061b5802a848e303392ee98a77ed5f441f1956d7eb56c8"
        }
    ],
    "package_integrity": [
        {
            "filename": "date-fns-sync-1.0.0.tgz",
            "hashes": {
                "sha1": "792ac2214c7cd6d291c4fd1bbbce79487fbeca60",
                "sha512_sri": "sha512-aYNJE4wnrB/c6T7k+BsacgReMvKBekqSFo0Pef3wWDmXbOQRymsHMzQD23/YQ5LIE8vk3VzZL/ihts+nYHG/EQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/date-fns-sync/MAL-2026-15551.json"